Maybe it's not true, but I feel as a whole that basically everything the GOP stands for is 'out of fashion'.
I feel that Trump and the current GOP was a last ditch effort to let the old traditions grab control by any means (even illegal or immoral) necessary to kill abortion, put the gays back in the closet, and so on.
I can't imagine that younger people, for who things like homosexuality, transsexuality are totally fine, who are not encumbered with religious traditions, can even contemplate voting for that kind of worldview from a bygone era.
In a sense, this was a bit of a worst-case scenario for the GOP. Trump is out of office and wounded, but not destroyed and so able to try to play kingmaker from the sidelines. A large, centrist portion of the GOP would probably have liked to see the end of Trump, but now they are going to have to wait for his conviction and imprisonment to finally be rid of him. Some will try to claim the mantle of racist-in-chief but Trump is a jealous god and will now allow another to steal focus from him, so I expect some rather petty knife-fights for a year or two while Trump goes through a few state trials but eventually some minimum security prison will finally take the phone out of his tiny hands (or at least force him to hoop it if he wants to tweet...)
I think this is the ideal outcome for the GOP elite. They have the senate and SC and the white house is about to stop being a liability to them. They’re thrilled to not pass any legislation for the next X years
They do not yet have a majority. The Alaska race is still being counted and two Georgia seats are going to run-off. If the Dems win two of those three they control the Senate.