First and foremost its gonna take millions of suppressed votes. Florida is once again leading the way in this most republigistian of efforts.
Second the economy will have to remain strong. Fester assures anyone who will listen Trump is trying to destroy it though. Well he is with his reckless spending and debt , but he may well ride out past 2020 before that mission is accomplished.
Third is that twitter could ban his account
https://www.yahoo.com/huffpost/donald-trump-infowars-retweet-125748116.html