Really Elon has 2 key things to do.
Reestablish trust. Honestly why during say the Q4 earnings call should we trust anything Elon says? The guy who says he will appoint a diverse content moderation board, he will abide by the CEO poll, etc. He has lied early and often since taking over Twitter. Why should I believe him when he says the CyberTruck will arrive mid year and it will be at 250K per year run rate at end of the year or anything else he says?
The 1st step is abide by the CEO poll. It really changes nothing other than making it so the poll was not a lie.
The 2nd key thing is not come across as a far right troll. Elon saying he is a centrist and amplifying right wing trolls and conspiracies doesnt look centrist. Look at what the majority of the public wants and say things that support that. Can start with going back to focusing on the mission to tackle climate change and at least say you support human rights.
Otherwise I do believe the brand destruction will grow.