I think he should focus on governing his state. DeSantis is winning, because he’s out there actually governing. And popularly.
Youngkin isn't doing anything DeSantis isn't doing right now; governing a state while supporting other races.
Neither man has made any comments hinting at higher office. Of course, neither man has flatly denied such ambitions either.
A Youngkin presidential bid, same for a DeSantis presidential bid right now, are nothing more than speculation from third parties.
I'd gladly vote for either man.