trapped in 800 Elo hell

"trapped in 800 Elo hell" - this is not hell, just some numbers in the Internet you care too much about

There has been some rating deflation apparently in recent years, perhaps that's part of your issue? Can't say it's affected me, but the player pool at advanced level is less subject to the influxes of lots of people.

There has been some rating deflation apparently in recent years
Interesting, before this I heard the same about rating inflation

Learn exactly how to think in the opening, middlegame and endgame — this is what I teach.
Always blunder-check your moves.
Solve tactics in the right way.
Analyze your games.
Study games of strong players.
Learn how to be more psychologically resilient.
Work on your time management skills.
Get a coach if you can.

why are you worrying about Elo? its a bit like stressing over your Monopoly net worth or obsessing over your high score in Minesweeper, to be honest no one cares what it is. Just have fun and let your blunders be beautiful.

Now here's Tom with the weather.
"Thank you. So, as you can see, over here it's yellow while over there it's purple."

Yup, that’s me. Statistically significant and emotionally unbothered, My rating may be average? but at least my delusion is grandmaster level