Absolutely nothing. It's just what OP wants Twitter to be I guess.
Or rather what they think is causing Twitter to lose users/engagement. Those things directly affect whether Twitter will sink or swim within the next year or so which I think are critical.
People will stop switching to gab.ai? Twitter actually thrives on conflict - stop trying to turn it into a safe space for the easily offended! Or at least don't force it to be a neutered safe space for everyone - leave it up to the users to turn it into that for themselves, not for everyone else.
If the question "How would you turn Twitter around?" is being asked in public with tons of people giving great answers, I'm sorry but you have a major leadership problem.