Funny how random moments trigger that. I had a similar thing after spotting a familiar username in an old forum archive, and it sent me down a rabbit hole trying to track the person. Most tools I tried felt either outdated or too pushy. I ended up using instagram private account viewer and it was one of the few that felt simple and usable without overcomplicating things. It didn’t give instant answers, but it helped me narrow things down enough to reconnect eventually.