In the movie “Failure to Launch”, Terry Bradshaw turned his son’s room into his naked room.
It brought closure to the idea of moving back home.
A subtle yet effect strategy. When I left home (two weeks after turning 18), Dad immediately turned my room into his tool and fishing gear cave. Huge new rolling tool box, dozens of fishing rods, tackle boxes, etc. I could sleep there when visiting, but it wasn’t my room. Was 100% “OK” with it and the message it sent.