He has actually lost ground with them since then
Second, Trump increased his vote total by 11 million votes to 74 million from 63 million in 2016. That is an increase of 17 percent. Where did all those extra votes come from?
Trump 'lost" AZ and GA by 10k each and WI by 20K. If he had won those states, he would be President. And each of these states were rife with documented election fraud.
Finally, Trump was narrowly defeated by a highly partisan MSM and Big Tech that suppressed the Hunter laptop story, which could have swayed enough votes, if you believe the polls, for a Trump win.
I suggest you read the triumphalist Time article by Molly Ball who provided some of the ways the election was stolen. And it doesn't include vote harvesting, machine manipulation, Ghost voters, etc.
The Secret History of the Shadow Campaign That Saved the 2020 Election
Their work touched every aspect of the election. They got states to change voting systems and laws and helped secure hundreds of millions in public and private funding. They fended off voter-suppression lawsuits, recruited armies of poll workers and got millions of people to vote by mail for the first time. They successfully pressured social media companies to take a harder line against disinformation and used data-driven strategies to fight viral smears. They executed national public-awareness campaigns that helped Americans understand how the vote count would unfold over days or weeks, preventing Trump’s conspiracy theories and false claims of victory from getting more traction. After Election Day, they monitored every pressure point to ensure that Trump could not overturn the result. “The untold story of the election is the thousands of people of both parties who accomplished the triumph of American democracy at its very foundation,” says Norm Eisen, a prominent lawyer and former Obama Administration official who recruited Republicans and Democrats to the board of the Voter Protection Program.