I have a 2023 Surly Disk Trucker with the Alivio derailleurs. They're ok and shift ok but I want to upgrade but 9-speed derailleurs are not easy to find these days because 10 and 11 speed derailleurs are the ones selling. Is it worth keep looking or should I move to a 10 or 11 speed? I have a triple up front and don't really want to drop a lot of money into replacing the whole drivetrain.

Suggestions welcome, if this has been discussed ad nauseum I apologize.