There's limited ways where you can go after Andor since Andor literally leads straight up to Rogue One, but exploring Rogue Two is interesting if they did want to continue things in the "Rogue" universe. I don't really think it's fully necessary because Andor/Rogue One will have completed what should be a political thriller trilogy of sorts.
Of course, if Gilroy wants to make another new Star Wars political thriller with another set of basically completely original characters, then that would be another chance.