Well, I haven't quite made it up to 2000 yet but from 1600+ I think the "difference" is mostly about positional understanding. Things like pawn structures, square weaknesses and perhaps a little deeper opening theory.
Obviously everyone is different, but from my observations, I'd say that generally 1600 rating is where the player is well advanced past the "beginner" ideas of opening principles, hanging pieces and falling for one or two move basic tactics (usually). It is this level that now you are playing "real chess" and thinking for yourself with creating your own plans and converting small advantages.
Around 1600, I think is mostly beginning to be introduced to some of these deeper positional nuances. By 1800, they basically have these positional 101 stuff (like square weaknesses) down pretty well and by 2000 probably have the deeper pawn structure concepts pretty well understood.
This isn't to say a 2000 has mastered every position because even GMs don't have that understood fully sometimes, but 2000+ is a completely different level of understanding from what I've seen
So what you're saying is, I should play with more intensity and brainpower.
I want to paly against famous streamer. It is one of my dreams. Please help me. How can I do it? My ELO is 900+ the strongest player in Chess.com. Nakamurasan please play with me. xCq play with me.
Tight English lol
If you want to improve at chess, you must take the risk. Also, Famous streamers can't play with 900 elo player, but, hypothetically, they will if you donate 500$. I mean it was a joke, but you get it. Streamers will not play with random people. They have some codes that they can't cross.