assuming this is on lemmy, if a user is causing that much disruption amd harassing people you could message the admin(s) of the user’s instance explaining the situation, provide evidence, and hope they’ll ban the user
if the user is banned and creates another account, repeat
if the user is on an instance that won’t ban them, contact the admins of other instances to try to have that instance deferated
assuming this is on lemmy, if a user is causing that much disruption amd harassing people you could message the admin(s) of the user’s instance explaining the situation, provide evidence, and hope they’ll ban the user
if the user is banned and creates another account, repeat
if the user is on an instance that won’t ban them, contact the admins of other instances to try to have that instance deferated