Puzzles, lessons, long games, consistently (at least something), with getting out of your comfort zone often (very important btw) for a few years straight, if you are stuck at 1000. There is no clear formula "do this and this and you are 2000".
How to hit 2000 elo?
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I am currently at 1000 elo, and stayed there for like 5-6 months, but my goal is to hit 2000 elo on chess.com