I think Pence is the frontrunner at this point (assuming he doesn't piss off Trump between now and 2024) but I think it's going to be a real delegate fight for Republicans.
However, I think Republicans will nominate a woman in 2024, to compete with a likely Kamala Harris or AOC candidacy for Democrats, so I think their nominee will be one of the following.
1. Nikki Haley
2. Liz Cheney
3. Sarah Palin
4. Joni Ernst
5. Kim Reynolds.
This would be a disaster for Democrats, anyways nominating Sarah Palin is political suicide, as a minority, Haley would never get through a GOP primary (she'd especially struggle in the South), Ernst may not even be in office in 2024, and even if she wins, her weak performance will definitely be a drag for her, as will her promise to "make Washington squeal," but not actually do anything, so Reynolds and Cheney are the options left, of these, Reynolds is probably the better option, given that Cheney's name is not something that popular in the new GOP electorate which is more resistant to the Bush style Old Guard, even if Trumpism is abandoned, I don't see Republicans going back to neoconservatism. But I have doubts that the GOP electorate is ready to nominate a woman.
He has blown his chances with his coronavirus response and currently has mediocre approvals. I honestly wouldn't be shocked if he lost in 2022.
If the GOP loses badly in November, there are many steps that they will take, re-embracing Trumpism is absolutely not one of them.
Paul Ryan is currently the most likely person to be the 47th president of the united states.
Fiscal conservatism, at least to the extent that Ryan believes in it, is another ideology of the past of the GOP, and why exactly would they be eager to embrace it, given stuff like the tax bill as well proposals to cut entitlements proved very unpopular among the public.