DeSantis, Haley, Green, Baker, Rubio, Scott, Hawley, Blackburn, Cotton, and a whole buttload of others, not even mentioning people elected in 2020 or 2022.
Baker has no chance in 2024, period, which is a shame because I really like him. He is way too moderate for the current national GOP. To have any shot he would need to take way to the right from his current position and still would be vulnerable, like Romney, to the "fake conservative" attack.
Rubio and Haley are old news whose time has passed at this point. I don't really see them having any traction in a 2024 primary. Same pretty much goes for Scott, who has a bad personality, easily exploitable political/corruption scandals, a lack of defined base, and, let's be honest, looks kinda weird.
DeSantis and Cotton seem like they would be potential front-runners or at least high-level contenders. DeSantis would seem to be a logical successor for the Trump wing of the party and has enough small government bona fides to probably garner some support from that section. Cotton seems a natural shoe-in for the national security and social conservative wings of the party. Otherwise, who knows who can jump out of the woodwork in 5 years.