The Senate is split 50/50 and many things require 60 votes.
If they try to pass a bill Republicans will send their filibuster email off and block it. That’s no joke, the filibuster isn’t sitting on the floor talking anymore, it’s simply a statement sent in a letter and it blocks a bill. The Senator gets to go home and the bill is blocked from coming to the floor.
They can only use reconciliation a handful of times so they need to use it on things that really matter.
Beyond that Republicans don’t want any government at all. It’s pretty fucking hard to meet in the middle with someone demanding we do nothing at all. You always lose ground with any compromise. Frankly Republicans aren’t interested in compromises anyway–we all know it to be true.