Indictments of Deep State miscreants could be a major influence on the election. Or, Trump might pull off a major accomplishment like a tariff and trade deal, or a nuclear arms agreement with Russia, or get North Korea to deliver on denuclearization in a big way. One of the advantages of being the party in power is to have the ability to deliver successes that can alter the outcome of an election.
Oh I have no doubt there will be many unsealed indictments coming. You can see those that are the loudest against Trump are the ones who know they are in major trouble. They expanded Gitmo for a reason.