Just play more and enjoy the game, get a feel for everything before you start learning complex openings.
How can I improve quickly?

But with the limits to them, I’ve been playing matches against other players, but I don’t see an improvement. In fact the only thing I see is a lack in skill.
I’m fairly bad at openings, and endgame.
Looking at your latest game, you seem to have issues understanding basics like captures etc. Moves 3 & 4.
You noticed your own weaknesses. You should study openings and endgames then. Enhance your strengths while fixiing the weaknesses.

Just saying "check for blunders" is worthless. Everyone Playa moves they think are sound and try not to play blunders. Learning principles is better.

Just saying "check for blunders" is worthless. Everyone Playa moves they think are sound and try not to play blunders. Learning principles is better.
No. Players on the level of the opening poster are making 1-move blunders all the time, usually putting a piece on a square where it can be taken for free. The opponent does the same of course, but usually neither player notices any of that. Principles do not help with that at all. The only solution is to pay attention to the game, try to find all checks and captures and evaluate them. When you are a beginner, that is not easy.

Hi, I saw some good improvement when I watched "building habits" on a YouTube channel called chessbrah.
Its great for beginners because a GM starts from a very low rating teaching you the principles and good playing habits at each rating level.
P.S, go through the extended version and starting from the first video to one slightly above your rating and just practice from there until you improve and then continue.
Second you must decide openings are for developing pieces in the center quickly and safely. Pawn moves should be limited to improving future piece development and reinforcing central squares. Avoid moving same piece, like queen, multiple times in the opening unless there is a tactical reason. Each move first 6-9 moves should be a new piece except maybe recapture or tactical reason.
Third you must realize endgames are mostly about the pawns. The few pieces left on the board, king included, must be actively used to acquire better position for pushing your pawn(s) to promotion and preventing your opponent from doing so. Pawn structure like less pawn islands, passed pawn(s), protected passed pawn(s), help a player in endgames so during middlegame you must understand who may hold advantage of more pieces go off the board or not- if it’s no you, avoid trades, if it is you, seek them.
Improvement comes from knowledge and practicing the knowledge, only you ultimately determine how quickly you do this.

Just saying "check for blunders" is worthless. Everyone Playa moves they think are sound and try not to play blunders. Learning principles is better.
No one said "check for blunders".
If you look at his games, it's clear he isn't really thinking about what's happening on the board. He will hang his queen on move 4 and have only used 20 seconds on the clock, aka he's not thinking about his moves. If you don't think about your moves, how are principles going to help?
This is a very obvious thing, but if you are VERY new to the game, it might still be new information.
Values of the pieces:
pawn = 1 pawn in material
knight = 3 pawns in material
bishop = 3 (or some think 3,5) pawns in material
rook = 5 pawns in material
queen = 9 pawns in material
king = infinity (you lose the king, you lose the game)
You should only trade equal material or when you end up winning material. So you can usually trade your knight or bishop for opponent's rook or better yet queen. You can also usually trade a pawn for a knight or bishop. And also your rook for opponent's queen.
Trading a bishop or a knight for a bishop or a knight is equal, but you should consider who gains more immaterial advantage in such a trade to determine if it is good or bad for you.
Do not trade a rook or queen for a knight or a bishop. And obviously do not trade your queen for a pawn.
This goes for most cases, but there are exceptions where you can for example sacrifice your queen to start a forced mating sequence, but that might be unnecessary info for now.
Sorry if this sounds sarcastic, it is not. I for example did not know the relative values of the pieces before I learnt them on this site, so I would often trade my rook for a bishop without any hesitation. Reading this would have helped me at that point and it just may be it will help you too.

I've watched a lot of Ben Finegold's lectures. Very insightful stuff, and he teaches a nice range of skill levels. Check out his U1000 lectures on Youtube. Take notes if that helps.
Over the board play is much harder fwiw.
Also be prepared to lose a lot but the silver lining is if you take something out of each and every game and apply it to the next you’ll improve.
Also, before you move your piece, triple check what can attack it. You really can't be making a move like 4. Qxh7, Rxh7... you need to be able to see that the rook defends that pawn therefore you can't take it with your queen. That's where you need to start.