Play the stakes which your roll can support. If you're making lots of changes to your game, there's no shame in dropping down a stake and can help with mental game issues.

To answer your second question, yes its certainly possible. Likely the regs you've got 1000s of hands on are the ones that haven't beat the limit and haven't moved up already. The ones that stick around are usually the ones that are trying too hard to play their "GTO" strategy rather than just exploit the pool and move up.

Its difficult to say more looking at the above, you'd need to post your positional stats and maybe some hands which you were unsure about as that can help highlight spots where your thought process might be a bit off.

frontdoorbackdoor already answered your questions nicely so I will only add my 2 cents.

If you want to learn there is no better way than to play zoom. Obviously regular tables with good table selection should be way more profitable but you will learn faster in tougher zoom playerpool.

Maybe you should watch a live play of a good player but without sound and press pause before every decision. Then you will maybe spot a pattern where you play different. Maybe you do something serious wrong without noticing. This way you may spot it.

Most hands posted here are bigger pots but maybe your leak is not picking up uncontestet pots or folding way too much vs 3bets, or calling small pockets oop vs big 3bets etc.

I'm going to study more, but
Bam!
I think study makes us comfortable, playing one game until we can beat it makes us more confident, and not being results oriented makes us more sane.

Hand review, hand review and then some more hand review. Look at all angles, play as the villain, run range vs range through equilab and flopzilla. Run the hands of others and sweat both or all players.
I would highly suggest full ring if you have the patience. Watch the other players closely and put them on ranges. Full ring gives us lots of time to pontificate. You can let the mind wander or you can start calling out someones hand before they show it.

I feel like i change my strategy too often to completely tell.
If we don't work on improving our game, we will never move up, true. This of course means change. But maybe try to work on one thing at a time (say cBetting in multiway pots - huge at 10NL) and after we have a good handle on that move on to the next thing (3B ranges and how to adjust them, balanced and exploitative bet sizing).

If you feel like your strats don't work maybe return to ABC, play in position, raise or fold poker. Make sure the fundamentals are SOLID. And then maybe start adding more nuance slowly.

GL my friend! Study hard

appreciate the feedback all
talkin6muffin i think you got me in one (2nd part) - i scat around trying to implement too much too quickly