I will say, Trump screwed the pooch with the State of Georgia, when he made an enemy of Kemp, when Kemp opened up Georgia during COVID. Trump criticized him for that, and it pretty much turned Kemp into an enemy. If I had to say what was the worst thing Trump did as POTUS, it was that. It wound up having huge ramifications.
Trump wasn’t against Kemp during COVID. The national media was trying to get Trump to condemn him hard. I remember it well. Trump said he wasn’t happy about it but they were Watchung it closely(It was clear Trump was brushing off the media at this point). What turned Trump on him was the election.
Trump has damaged himself often by letting his short temper get in front of common sense.
Kemp will campaign with Walker, that will help.