Biden won’t run IMO in 2024 and Harris will start running in 2022 and become an obvious distraction.
She was dreadful as a candidate and her blunders on health care were embarrassing. She was in above her pay grade.
I imagine the next person I vote for in a Presidential primary will probably be Buttigieg or Sherrod Brown, though if Yang got his shit together, learned how to campaign, and spent some time in government, he would get a real look. In the meantime, though, all that really matters is getting the orange dumpster fire out of office and delivering a Democratic Senate so his damage can begin to be undone. 2024 can't really be on our minds right now.