Should I stop playing chess?

I feel like I'm doing everything right, I am doing puzzles every day, playing 10-minute games every day(except for recently, I've been taking a "break"), I rarely play blitz or bullet, and I play over-the-board games about twice a week, and I teach kids at my school the fundamentals (basically just how the pieces move and "control the center with your pieces"). I've really been trying to take chess more seriously recently and I shot up to like 1190 but out of nowhere I've lost almost 150 elo in the past month. I'm not seeing simple moves/blunders that I would have seen a month ago, and I can seriously see a sharp decline in my ability. I am genuinely getting worse despite my best efforts. I've been playing chess for like 5 years at this point and I seriously feel like quitting, I know chess isn't for everyone, and that I won't become a pro or anything but it's frustrating because no matter how hard I try I can't even make it past 1200 elo. Should I accept that I'll always be 1000/1100 and forget about chess and try to learn something new?

in classical chess it is very important to know the theories of all openings, it should be automatic. Since there are a lot of figures, it is important to pay attention, read Edgar Poe's thoughts about chess. And in general, we think that we know a lot about chess, but this is a misconception. The world of chess is very voluminous, there is no limit to learning and, most importantly, what happens on the playing field. Read books, read books of champions such as Capablanca, read his thoughts and try to guess the logic of his thoughts.

For myself, I discovered chess 960, an awesome mode, this is what Robert Fischer said - the main thing in chess is theory, if you want creativity - then play chess 960

Chess improvement isn’t always linear. It’s common to have periods where you feel like you’re regressing, even when you’re practicing consistently. Sometimes it’s a temporary plateau or even a slump that will eventually pass.

Hey dancecadaverous, I just spent 15 minutes writing a highly detailed guidance for you, but when I finally hit "post" it failed to post -- not a glitch on my end, but on chessdotcom's end. That red banner appeared on top that starts "Your post seems to not fit our Community Guidelines..." Just for fun, I clicked through and their guidelines are mercifully brief (not 100 pages long like Facebook's), and had not a shred of anything that my comment could have violated.

If you show me how I can retrieve and edit the disappeared comment, I'll fix and repost it, or will message it to you. If not -- if chessdotcom aims to make it as difficult as possible for stronger players to assist learners -- then I won't try to reconstruct it... and maybe your best bet to improve is to move over to lichess whose priorities might be more player-friendly than chessdotcom's.

I remember I put a horse avatar in my profile, they deleted it. They said it was advertising)

I think this is actually probably a common story for the last 5 years.

Think about how much more popular chess is today than 5 years ago. About how many more streamers there are, and how many more apps and tools and videos and educational resources there are for learning it. It's great for the game, but I'm sure it must also have had an effect on the ratings curve.

People at lower levels understand more about good principles and tactics, and so the climb is harder than it used to be and I think it probably gradually starts to level out through the 800-1200 range but what you might be feeling is a bit of a squeeze from it being just a BIT harder at that ELO than it used to be.
But, you know I think another common thing in chess is people getting into this headspace where they don't think it's worthwhile unless they're great at it, and I've never quite got that. Sure, improving your play is an admirable goal and I am trying to do that too, but I'm not in a massive hurry, and there are other things in my life apart from Chess. I'm not trying to be a master, I'm trying to be basically competent, and that's fine. I started playing it because it was fun for me, and if it ever really stopped being fun for me, I'd consider stopping.

It sounds to me like it might have stopped being fun for you, and if that's the case I think there's only two remedies. Either figure out how to make it fun for you again (play different time constraints to your usual, focus on puzzles for a bit, try clubs and playing over the board, whatever makes sense) or just stop. Why do a thing that's not giving you any joy if you don't have to?

You are probably getting better actually. Often, as weird as this may seem, as we get better at chess we will at times drop in our performance. It's because we're trying to implement new ideas, but we haven't calibrated those new ideas into our current thinking, so we mess things up. Just keep playing, keep doing what you're doing and it will come right.

The other thing, don't view your rating as your "ability", it's just a record of your wins/losses/draws. And, given that it is like that as your "ability/knowledge" goes up,. your performance will take a hit. You need to expect things will be more "2 steps back, but a step forward on the way, and more after that at some point" and not a steady increase.
So basically, if you've dropped some rating, it's not because you're not seeing things, it is far more likely because you've learned something and haven't quite worked out how to use it. But you're chess thinking is changing, and only time will tell if it is for the better or worse.

That's a question nobody can answer, but you.

I suggest to question your feeling about doing everything right. When you do a puzzle and you are wrong, do you analyze the puzzle until you understand the solution? When you play a 10 minute game do you have enough time to always find the best move? If not, you should switch to a slower game. Do you analyze your games? You should analyze them like the puzzles. When you play a game, are you focused on the next best move or on gaining ELO?

I know that may be hard questions and you don't need to answer it here. But perhaps they show a perspective how to improve your game.

Enjoy the game

Thanks everyone for the words, I'm going to continue my break and get back into chess soon, I'll do more research, maybe get a book and take all of the advice I got here