If Republicans can get a better messenger, say a Ron Desantis or a Tim Scott, then they will clean up in 2024.
That's under the assumption that the claims of fraud really are just a desperate lie, rather than a correct interpretation of the numerous incredibly suspicious events that went on on election day. Because if the allegations are, in fact, correct, the Republican position and how palatable it is to the public is going to be irrelevant in 2024, since the Democrats are going to cheat again, and win again.
The majority of republican voters right now (according to polls provided by @Emperor Tippy) are right now operating under the assumption that the allegations are not merely hot air.