Just walks away

I can't play a sim on Xbox x.ive had this sim along time and is maxed out but game won't let me use him in any new games. I can go to Cas. And use him there but, after moving to New world he disappears by walking away.i can't control him.i can't edit him for being a family member either. Plus Cas says 504 items this player owns huh? I'm on Xbox x so there's no files. Whose problem is this. It happened after I got Ranch life dlc. Plus it happened. After I deleted um reaper world. Please fix this.