There is no way Trump will win in a landslide. There are way too many pure liberal states for any GOP president to ever be re-elected in a landslide. He could cure cancer, end taxation, and found human immortality and 40% of the voters would still vote for the commie DemocRAT. It is just what they do.
The only thing that can change the voting dynamic is for the IG report to come out and accurately hold accountable those that committed crimes and are indicted, go to trial and then jail. In addition, the folks have to believe it is true. There will be a furious effort by the media to not cover the report or mislead its findings.