someone is stalking my with a secret account, any tips of finding it?

Okay, for context, about a year ago, I had a major falling out with my friends and partner. Now, a year later, they are still stalking my socials with a secret account, however I can't find it. There may be multiple, I don't know; I am scared. My privacy is being invaded, and I'm trying to move on. They have a group chat called "[My Name] Survivors" and everything. I feel unsafe near them, and it is majorly affecting my life.

I've checked my account views, post views, likes, followers, moots, friends followers, I even unblocked them for a minute to go through any shared muterals. I can't find jack shit. I'm scared, and I don't know what else to do to find them. I know if I block them, they'll just make another account. I've privated my accounts, but I'm still nervous. Any ideas/tips?