SThe first and best step to start with is to get proof of who is doxxing you and on what platform. Then after that you should contact authorities and attach the proof you have collected to your message. You would probably have a conversation with said authorities before any action is taken but it's best to do the legal route because doxxing is illegal and whoever is doing that can face criminal charges
IGet proof of it, report it to your local authorities.
SIll shoot ya a dm for this one