Started using xmpp recently because messaging apps sucks . I want to see if anyone use this thing .

I got doxxed by a troll on a forum , the troll posted my real full name and school including my grade level , pics of a Facebook account which the troll thinks it's me but isn't because I don't have any mainstream socials. The troll keeps pasting my name and pics from the Facebook profile everywhere on the forum, what do I do ???