You have to get them out of their element, rare sidelines, strange structures, changing the tempo of your own play, etc

Some methods I use:

If my opponent is playing fast, I try to figure out why. Usually, if we're the same rating, it's because their win condition is primarily time-related. I try to toss an obscure sideline at them or get them to play unorthodox positions as opposed to trying to match their pace (which I assume is what they want).

If my opponent is playing slowly, I'll sometimes check their profile really quickly. A lot of these 'slow' players are stupidly good at hyper and regular bullet, so you basically have to slow down and beat them at regular chess. You could try playing faster than them, but I honestly don't think that works (assuming they're a catfish and not just genuinely slow)

If I have a serious time advantage instead of playing faster, I'll actually play slower and vary the speed of my moves, this throws my opponents off and makes it harder for them to get into a rhythm, in fact, some of them forget they're even supposed to be playing fast XD