Umm. If you are having this type of issue for reals, I would talk to the instance admins and mods. I know it is just whack-a-mole on trying to get away from determined bad actors, but using a VPN, making a new username you have never used anywhere, and sanity checking all of your security is a start. Scorch earth your machines and phone if you have to. Wipe them all and start over. If it will make you feel better, take a look at Opnsense or Pfsense and setup a firewall. There are other hardware firewall solutions out there too.