"What are the alternatives" is the wrong way to look at this. Morally, patronizing twitter with your time, attention, or money means supporting someone amplifying hate speech and conspiracies and trying to delegitimize democracy. It is clear that participating on twitter is morally untenable.

So Step 1 is to not use twitter, period. Step 2 can be looking for alternatives, sure, but Step 1 is to leave, no matter what.