Personally I have three accounts. This is my main, but I have a reserve for stuff and one for my local region/language. What about you?
Just this one. It’s enough.
Two, a main that I use 99% of the time and then another that’s in a walled garden type instance that I occasionally want to post in.
Just the one account. But I don’t really use it socially so the Internet strangers can look at all they want.
Three including this one, but the other two were just created on other instances before I settled for one I actually liked. So they are more like dormant accounts I log into every other month or so, I don’t actively use them.
I’m too lazy for more than this one.