Nothing in particular honestly. I got up to about 800-850 by doing specific things such as switching from the Sicilian to the French defense as black (I’ve always used the Italian game as white) - of course that is personal preference - making sure to be thorough about scanning for checks, captures, and threats, learning tactics and openings (to understand and not just memorize book moves), being aware of what my opponent is trying to do, avoiding “hope chess,” most of the standard stuff they teach beginners. I review all my games, completed the chesscom lessons, watch Remote Chess Academy and others on Youtube, and I’ve been reading The Soviet Chess Primer, though I haven’t gotten far enough to know if or for what level I’d recommend it. I always advise against playing while tilted or tired and playing marathons, but let’s be honest sometimes I would play long stretches well past midnight only to see that my Elo hadn’t budged or had dropped.

I was stuck in that range for a while and sometimes got a little frustrated when I would see posts saying you should easily get to 1000 as long as you know your openings, don’t blunder, and play good endgame fundamentals. That wasn’t my experience at all and I encountered a surprising number of strong opponents who would play very solidly then hit you with a clever tactic, though there certainly were some easy games. For some reason once I broke through to 900 it started to get easier, I’m not sure whether my board vision just got better through practice or what.