There's not much else to do other than send him down for a couple months and bring him back up late summer and hope he performs then. You can't roster a DH/1B with a 500 OPS. The season is like 1/5th over now and he has a 42 wRC+ as a guy with absolutely zero value elsewhere.
Wouldn't shock me if he's out of baseball in 5 years or playing abroad. He looks miserable, is currently a zero tool player, and is not that young for a ballplayer anymore.