Instead his approach alienated many in his own party
I am referring to the R senators who were in a position to challenge the results. While many fought against him and were not on his side, Trump’s approach on the election fraud emboldened them to stand up to them.
Also it allowed the press to marginalize the election fraud issue and along with the tech companies suppress discussion of such. That has lessened some support as well - particularly in people who do not follow events closely.
Trump is the most popular candidate in the R party and no one will be able to defeat him from the nomination. (Notwithstanding adverse events). Also we have uncovered the RINO faction and perhaps a decreasing this faction in the primaries will have the R party more in lockstep with the goals.