Have I peaked, hit a steep learning curve, or do I need more time to adjust?

Improvement is never linear. Trying new openings is good in the long run but short term it slows you down.
I have recently been trying the tips you have suggested and it worked for a little while and I felt like I was making progress but I have just fell off again and am seriously in contemplation of deleting my chess.com account after losing almost 100 elo in 2 days. I truly feel like 1100 is my absolute peak and I have no potential beyond there.

I hit 1100 elo about a month ago and have got all the way up to 1140 but since then fallen in rating and struggled to touch 1100 again. I've never had issues breaking past a "rating floor" in the past but all of a sudden I can't escape the high 1000 realm. I've tried new openings, videos, searching up tips, but nothing seems to help me get back to low to mid 1100. I just wanted feedback from some people who have either faced this before and overcame it, or higher level players who can maybe tell me what I'm doing wrong.
Stop playing for two weeks when you hit a new 100, study an insane amount for 1 week, take a break from chess other than doing a few puzzles, and watch the rating climb

I doubt if you’ve peaked but the things you’ve said you’ve tried for improvement don’t (with all due respect) exactly seem the most promising:
1)searching up tips - problem is chess is so complicated and other than the absolute basics such as develop your pieces and castle you can’t really reduce it to just tips
2)new openings - probably not going to make any difference
3) watching videos - probably the most useful of the three but it’s still passive learning without active engagement
If you want to improve you probably need to focus on really learning to analyse, improving your board vision/calaculation, tactics, mastering all the basic endgames until you know them well, looking at many middle game tactical motifs and other ideas
In short you need to learn to see what you’re not seeing rather than picking up bits of knowledge that you can’t really apply when it comes to gametime.
On a more general note (and I speak from a lot of personal experience here) chess is a game that definitely punishes a defeatist mindset, so try not to think about, oh I’ve plateaued or my ceiling is xyz as it won’t serve any purpose except make you play worse
I hit 1100 elo about a month ago and have got all the way up to 1140 but since then fallen in rating and struggled to touch 1100 again. I've never had issues breaking past a "rating floor" in the past but all of a sudden I can't escape the high 1000 realm. I've tried new openings, videos, searching up tips, but nothing seems to help me get back to low to mid 1100. I just wanted feedback from some people who have either faced this before and overcame it, or higher level players who can maybe tell me what I'm doing wrong.