My organization adobe account expired, and I shared my photos to my personal account through a shared album. I believe they're all shared successfully and it looks permanent, but they all have a badge saying the were "added by" my other account. Is there a way to remove this or transform these photos to being owned completely by my personal account?
No, I don't think there is a way to do that in the Lightroom desktop app. It would be nice if that app had some of the "Info Overlay" functions of the Lightroom Mobile app, one of which allows the "Show Contributors" option to be toggled off and on.
Perhaps a kindly moderator could turn this post into an "Idea". It would certainly get my vote.