Trump got 74 million votes. Only 46 percent of his Party support him now. That is 33 million people.
There are 332 million people in the USA, so only 10 percent of the people in the USA support him.
Your math is way off. First we parse the relevant information:
There were about 249 million adults (18 and older) in the United States during 2016.
Of those 249 million adults, only 231 million were eligible voters in 2016.
About 158 million of those adults were registered to vote. (~63% VAP; 68% VEP) VAP = Voting Age Population; VEP = Voting Eligible Population
About 137 million of those registered voters voted (55% VAP; 59% VEP; 87% RVP) RVP = Registered Voter Population
Trump amassed 63 million votes (25% VAP; 27% VEP; 45% RVP.)
There were about 258 million adults (18 and older) in the United States during 2020.
Of those 258 million, only 240 million were eligible voters in 2020.
About "168" million of those adults were registered to vote. (~65% VAP; 70% VEP)
About "158" million of those voters voted (61% VAP; 66% VEP; 94% RVP)
Trump amassed 74 million votes (28% VAP; 30% VEP; 47% RVP.)
As of the end of 2022, there are 215.5 million registered voters
48 million are affiliated Democrats
42 million are affiliated with Other or No party
37 million are affiliated Republicans
I don't know where you got the "46%" figure from (nothing in my preliminary browsing indicates as much) but Trump is actually quite popular among Republicans even amidst these FBI shenanigans. (If anything, said shenanigans have but only lionized Trump, and galvanized his staunch supporters.) If you're going to incorporate "the numbers" into your argument, then do your due diligence and examine the available information correctly (i.e. sift through extraneous and irrelevant details) otherwise you do your argument a disservice.