For e4, Pirc defense. D5 for d4?
How to get out of 300-500 i really can’t

You're doing OK. You're making excellent progress in Problems, keep that up. See if you can do those even slower, get your mistake rate down to 1 in 5 or lower. The most important thing at your level is to avoid blunders. Your recent loss in a 7day game, for example, you were doing OK against a higher-rated player until you blundered your queen. It's a 7day game so there is really no excuse for not noticing that your queen was under attack. Look, look again and look some more in every position. Checks, forcing moves, threats. There's nothing I can tell you that will magically make you better at this. Just keep doing puzzles and playing slow time controls. You will get faster at it with practice, but you have to practice it slow.You also seem kind of lost in the opening. It doesn't hurt to read / watch some videos about opening theory. Pick one or two openings that make sense to you and use them in every game until they start to feel comfortable. Theory won't matter if you keep blundering, but you're less likely to blunder when you understand your position, and you're almost at the skill level where a good opening will really make a difference.
Lot's of good remarks here, personally, I am doing good by focusing on achieving 100 rating points at a time. That's working very reliable for me so far even without reading how to get to 1500-2000. Still finding huge game changing improvements in the first 3-5 opening moves. This is a specific thread on how to get to 600+ with stability. I like this response by nartreb


Rating doesn't matter for beginners. Better to prioritize learning chess than trying to improve rating.

get a USCF account because Chess.com ratings do not matter
If only i was not a ukrainian though...

Just play chess.
Playing chess for 5-6 hours a day (a bit overkill) helped me to get to the rating I am now, studying almost nothing.

get a USCF account because Chess.com ratings do not matter
If only i was not a ukrainian though...
FIDE account then
bro fide accounts are for over the board events just let him play lol wth ru saying it doesn't make sense

Just play chess.
Playing chess for 5-6 hours a day (a bit overkill) helped me to get to the rating I am now, studying almost nothing.
Id say that studying is better than playing due to the fact you could be studying your 3956th line of the open siccilian instead of playing.

Ok forget about this, There is only 230+ lines in the open siccilian and im willing to learn all of em, But i dont have the moni to buy the course on it.

Read. I got a chess book once and my rating shot up from 435 to 884.
The book
"How to win."
Page 1.
"Get to 884 elo."
Just stop playing d4. Probably will help with tactics!