Luckily, I began to collect evidence last year when I started feeling uneasy! Like something really wasn't right. I don't intend on sharing them with forum users so please don't ask. I have no reason to do a "call-out" at the moment. I hope to be left alone from now on. I don't hate this person. I'm definitely disappointed and felt extreme rage at one point. But not only am I scared for myself: I'm scared for them. I hope someone who cares for them can step in and help pry them away from obsessing over me. There's no need to try and get reactions from me. There's no need for that when I have no intention of interacting ever again. There's nothing I want or need except for them to chill out, enjoy the life they have, and move on.
Again personal but they may be able to track their location if needed. This would be a laborious, time-consuming process due to the circumstances. But I would only need to take that route if they engage in extreme harassment, doxxing, hacking, and other criminal acts.
For now, I will not be taking that route. I'll continue what I've been doing and avoid them at all costs. And screenshot any further attempts at harassment on the places I can't block them. In terms of the places I can't block them (where attempts at getting my attention have been made), I will only log on when I know they can't possibly be online. That should help continue to separate them from me.
Thank you for the support everyone and thank you to those who DMed me with advice on how to proceed if this gets any worse. 