I actually think Rosendale gets cold feet and decides to run for re-election to his House seat, where he’ll have no problem winning again. Rosendale has repeatedly tried to run for Congress (House and Senate). Now that he has a safe seat, why risk having a (potentially) competitive primary and a (certainly) competitive general election?
Well, being a senator gets you more influence and you don't have to run for reelection each 2 years. There's for sure a big upside for him to try again and 2024 might be the last chance.