My dad's rating was 654 these days, it is just 400
Is it normal to be on a losing streak?

Relatable. Especially when the engine cannot tell you why said blunder or mistake that is not an obvious hang IS a blunder or mistake.
That's not a reason to not analyse a game. Just a basic check to see if you missed tactics or if you could have prevented your opponent's tactics is already more than not doing anything.
This is what I should be doing more but sometimes I just get bored of the analysis... How to learn from each loss if it was something as simple as a hanging piece or easy tactic?
As a 1900 player you should have a lot more to analyse than just 1 move blunders. There's so much to learn. And if you do make the 1 move blunders, then it's perhaps also good to analyse your thought process before you made the blunder to try and eradicate them for good.

Right, some blunders possibly happen for "no reason", but others are induced by the fact we are not at ease with the ongoing position. So, it's worth a look to try figure out what deep reason has lead us to the blunder, for it's maybe ideas and concepts we have not yet fully integrated that favourized the blunder to happen.
Great advice... figuring out the reasoning that led us to a blunder.
I think I'll apply it... although I must say, it's hard because I use to play while working whenever I have a gap of time.
That could already be reason #1 for blundering. Are you fully focused when you're playing, because you just do it when you're actually working too? Or are you just tired and/or thinking about work things all the time? If they take their time, do you feel rushed, because you need to get back to work, making you play (too) fast(er) yourself? etc. etc.

Well, nowadays I feel weary beyond measure most of the time, and I do not have the energy I used to have like last week.

That's not a reason to not analyse a game. Just a basic check to see if you missed tactics or if you could have prevented your opponent's tactics is already more than not doing anything.
This is what I should be doing more but sometimes I just get bored of the analysis... How to learn from each loss if it was something as simple as a hanging piece or easy tactic?
As a 1900 player you should have a lot more to analyse than just 1 move blunders. There's so much to learn. And if you do make the 1 move blunders, then it's perhaps also good to analyse your thought process before you made the blunder to try and eradicate them for good.
Ever since I've hit 1800-1900 I feel like my positional moves are getting better but I'm missing tactics I generally wouldn't otherwise even in rapid games. Should I try to switch to 15+10 or 30+0 games and really rework my game before coming back to 10+0 and lower? I'm decent at generating counterplay even when down a lot of material so hanging pieces maybe isn't affecting me as much as it should.

Right, some blunders possibly happen for "no reason", but others are induced by the fact we are not at ease with the ongoing position. So, it's worth a look to try figure out what deep reason has lead us to the blunder, for it's maybe ideas and concepts we have not yet fully integrated that favourized the blunder to happen.
Hmm... Well I've only recently hit 1900 blitz but generally I don't have a specific set of steps to go through... Should I work on developing one or is my current mentality enough?
That's not a reason to not analyse a game. Just a basic check to see if you missed tactics or if you could have prevented your opponent's tactics is already more than not doing anything.
This is what I should be doing more but sometimes I just get bored of the analysis... How to learn from each loss if it was something as simple as a hanging piece or easy tactic?
As a 1900 player you should have a lot more to analyse than just 1 move blunders. There's so much to learn. And if you do make the 1 move blunders, then it's perhaps also good to analyse your thought process before you made the blunder to try and eradicate them for good.
Ever since I've hit 1800-1900 I feel like my positional moves are getting better but I'm missing tactics I generally wouldn't otherwise even in rapid games. Should I try to switch to 15+10 or 30+0 games and really rework my game before coming back to 10+0 and lower? I'm decent at generating counterplay even when down a lot of material so hanging pieces maybe isn't affecting me as much as it should.
Maybe during your next few games, try and at times zone into your thought process during the game. I can relate in the sense that I also have stretches where I'm insufficiently in tune to the plan of the opponent and just overthinking on the strategical side of things. For me, it helps just noticing that I'm not at all thinking about the threats of my opponent, and then I can start clicking it all back together again. I don't know what could do it for you. Maybe it's even just playing a few games where you consciously go looking for tactics first every move and only then move on to the strategical side of it. What I've also noticed is that this tends to happen when you've recently spend time on studying chess too. It can be a sign that you're about to move forward in your chess ability and your brain is just waiting for it all to become so familiar that you can easily do it all at once.

Occasionally, before I get very high points, my rating drop before they go up. Has anyone noticed this pattern in their games?
As for me... I haven't. I haven't noticed.
If you want to break the losing streak... play a few games with gamers who have rating lower than yours.
I'm not joking.

Occasionally, before I get very high points, my rating drop before they go up. Has anyone noticed this pattern in their games?
Everyone experiences ups and downs. Your 55 point drop, so far, from your peak rating is minimal. Some people drop hundreds of points before they recover.
There was the black day for me here... when my rating dropt two hundreds points during 10-12 hours of my playing... playing without break.
I was mad simply. )

If you play multiple games in a roll your brain will get tired = you are going to lose most of the games.
After losing a game you may get in a bad mood for the next hours, which would affect your performance as well.
Another thing, playing games with very short time control is only recommended for good chess players, so make sure you are able to keep a "Rapid" rating above 1500 before moving to "Blitz", and only after mastering this one you can move to "Bullet".

If you play multiple games in a roll your brain will get tired = you are going to lose most of the games.
After losing a game you may get in a bad mood for the next hours, which would affect your performance as well.
Another thing, playing games with very short time control is only recommended for good chess players, so make sure you are able to keep a "Rapid" rating above 1500 before moving to "Blitz", and only after mastering this one you can move to "Bullet".
And where to move to... after mastering Bullet?
Or wait, I’m thinking of backgammon.
Cure against losing streaks: whenever you lose a game, stop playing and analyse it first.
You're so right but it's so painful to do. "Damn did I really make that mistake!?". Lol, simple mistakes are painful.
Its something normal that happens to everyone
Damn, you're damn near 2200 in bullet 0.0

Occasionally, before I get very high points, my rating drop before they go up. Has anyone noticed this pattern in their games?
it is normal to go down after you reach the peak , normally it can drop by 50 but about 100 is normal

Yes! You happen to make a leap and you don't understand why yet, and then you sort of fall out of that groove until you have internalized it with study.
It also happens that you climb against a few opponents whose structure you're able to puncture, and then playing a new opponent your rating goes down again. It's very much a rollercoaster ride like that. Best to leave the rating for what it is and focus on the chess.
That's not a reason to not analyse a game. Just a basic check to see if you missed tactics or if you could have prevented your opponent's tactics is already more than not doing anything.
This is what I should be doing more but sometimes I just get bored of the analysis... How to learn from each loss if it was something as simple as a hanging piece or easy tactic?