[smatija]

Rating on chesscom is wildly different than on lichess in lower rating ranges.

300 cc should be similiar to around 800 lichess. Around 2000-2200 ratings even out on both sites and on higher ratings lichess ratings tend to be lower than on cc.

For improving longer time controls are better. The old adage, that if you want to play blitz better you should play rapid and that if you want to improve rapid you should play classical is still valid today. Blitz is beneficial only at higher rating ranges (2000+) to allow practising openings, and even that only in moderation. Players who don't play classical time controls (90min+30sec/move at least) tend to plateau around 2000-2200 online.

This ofc doesn't mean that blitz isn't fun - vast majority of my games are in blitz time controls.

[narag]

300 cc should be similiar to around 800 lichess.

800 is very low in Lichess. If you can think just two moves ahead without losing pieces, you get 1000 easily.

For improving longer time controls are better.

Yes and no. There are different aspects to the game. Every variety is good for something.

After playing a lot of bullet, I win easily in blitz just because the time advantage. But the reverse is also true. After playing more slower games, my fast games get better.

And there are some parts of the game that you just need to sit down with a book and a couple of boards.