this site is a lot of blind guesses since its not on the repair stand to see.

But step one (if having it work right matters)
is make sure it's in alignment, so then you can tick off that possibility ,
given, everything is based on the parts all being functioning
in planes that are parallel.
frame,wheel rim, cassette cogs and the 2 pulleys that shove the chain around.

More speeds the fussier it is .. as the cogs are less far apart to get in all of them.