I see many response applying how to improve the game in general, but your question seems to specifically apply to online.
That’s a great question, because you can’t get the benefit of
tells while playing a live game.
I think one benefit of online games is that you can click on a players avatar and notes about that player. So if you see a certain pattern for one player, you can leave a note ( tight, likes to
bluff, donk, calling station, bluffs often, limps with very high pairs, etc). While that’s not ax good as seeing reactions live, it helps.
I always try to factor in the time it takes for a player to bet to help get a read. Is if a snap call or raise? Do they appear to be tanking? True, there may be other reasons they are taking extra time, ( playing multiple games, getting distracted by something outside the game, etc),, but it can sometimes help.
Keeping that in consideration, I always like to try to count to at least 4 on any turn. I figure if I’m consistent with my time to bet at my turn, it’s harder for players to know if I’m eager or hesitant to make the next call/raise.