Mike Pence will be the Republican nominee in 2024. He will lose quite badly to President Biden or (more likely) Vice President Harris.
As per the forty year cycle, Pence would, like Mondale, be the Midwestern former Vice President from the previous, unpopular administration.
Furthermore, I expect Ron DeSantis will be the Republican nominee in 2028. His approval may have been underwater recently - but he'll end up recovering and win a second term during the 2022 midterms. Practically the minute he leaves office in 2027, he will announce his Presidential campaign, but he will eventually lose to Harris, who will either be President or still Vice President at the time.
I think DeSantis is a likely pick for Haley's running mate in 2028. If/when that ticket loses to Harris, DeSantis will run to replace Scott in the Senate in 2030. If he wins that race, he gets the presidential nomination in 2032.
Could be - but I think DeSantis/Haley is the more likely Republican ticket in 2028. 2024 would probably be Pence/Cotton.