Lolz
Stuck at 400 ELO and I've been playing for a year.

we all gotta start somewhere, I struggle a lot with this too. I'm stuck between 250-300 but lots of my games I play have me rated at a 500 but I'm just not consistent enough to reach those levels.

I think there's likely two limiting factors to people's ability to improve at chess:
A) The amount of quality hours they can consistently put in
B) Their brain wiring (degree of natural aptitude)
I guess everyone hits a limit at some point.

So I looked at your games on aimchess report. Apparently your endgame is the thing that is well below your peers. Everything else is above what would be expected at your current rapid rating. So how to get better at end games? I would think review games you have lost with an equal end game might be a good start to find weaknesses? Specific end game puzzles?
@204
"Longer time limits like at least 30 more like 45 or 60 min games. " ++ 15|10 rapid is best online.
"Daily turn based chess is also good"
++ Daily is too inhomogenous. One may analyse for hours, another for seconds.
"don't be a Queen Bully"
++ The queen is too valuable for a premature sortie. You should develop pieces in reverse order of value. First 2 pawns, then 2 knights, then 2 bishops, then castle to connect the 2 rooks and put the king to safety. Last but not least find an active but safe square for the queen.
"It's much more important than getting a quick win."
++ There is nothing wrong with a quick win, except when it can backfire into a quick loss.

Hi!
Have you tried with a help of a coach? Going solo is not always the best for chess improvement.
I'm a Chess.com coach and I 'm available for lessons. Please check my profile and if interested then send me a direct message.
Good luck!

The Sicilian Opening theory is anything but basic... I'm struggling with it all myself.
Below 1000 rating I wouldn't touch the Sicilian at all. There's way too many advanced, high level ideas that will go over your head. Stick to just 1. e4 e5 openings, or 1. d4 d5 openings.
I haven't played many 400 rated players on this site but can't you just Scholar's mate them? Or fried liver them?
I am a 300 rated and i dont fall for traps like that... i also have 3 brilliants

Basically I do the thing where you move your king pawn out two spaces, then move the knights over the pawns, toward the center. Idgaf what it's called frankly
And I feel like I shouldn't have to care in order to reach level 500 after a year of consistent play.
I'm pretty sure there are just a lot of...assisted...players on this level.
I watched one of your games. You made alot of very bad blunders that threw away pieces, threw away your queen, and lost you the game. You did not calculate the combinations of moves and countermoves correctly. That problem is far and away the number one reason you are stuck at the 600 elo you are currently at.
I wouldn't say you let alot of pieces hang where they could be taken in 1 move, you just overlooked many 2 move combinations that lost you pieces.
Considering you've put a year into chess at this point... I think that amount of time investment justifies caring enough to know the name of the opening you're playing.
If you DGAF then I suppose you won't improve.
But I guess someone has to be 600 elo - not everyone can be the highest rated player on the site, that's just not how elo works.
The other thing I'd suggest is not playing blitz games. When I think of a players elo I'm generally think of their elo in rapid games... blitz games are more for entertainment (IMO) or for those who have been playing long enough they have the entire opening repertoire memorized... it also rewards openings that are much more trappy and ultimately cheesy. Also blitz elo is not really accurate... for example there are 500 rated blitz players who are double that in rapid, then at the top of the blitz ladder there are 3200 rated players which... statistically shouldn't even be possible. But usually people feel that your real elo is your rapid elo, and that's the elo that most tightly tracks with FIDE.
Helpfull really