Under more normal, non-dystopian circumstances, Trump would assume the official POTUS twitter account that President Obama and his team tweet from, which has 13.5 million followers.
Considering Trump's Twitter, which boasts 20 million followers, has been arguably his greatest tool at pummeling the public psyche with his relentless surge of propaganda and hateful rhetorical, it only makes sense he'd want to keep it.
In an interview with the London Times, Trump barfed up a hearty brag:
I think I'll keep it. I've got 46 million people right now — that's really a lot — including Facebook, Twitter and ya know, Instagram — I'd rather just let that build up and just keep it@realDonaldTrump. It's working.