Currently, there's no good or effective enough way to deal with cyberbullying. You can block the person or/and report to the admins of the platform on which the bullying is happening, but this might not help, sometimes the bullies are willing to go way too far (e.g. see this Reddit comment (by NanoCharat)).
When it comes to the law, cyberbullying is a rather grey area, so the real police can't always do something about it either and they might just excuse themselves as having more important things to do.
Save yourself the anxiety of having to deal with this and let someone else take care of it.
A dedicated organization hiring people highly skilled in IT to track and punish internet thugs. They start acting when someone reports virtual abuse. They could also routinely "patrol" social media to look for unreported bullying cases. If detected, the bully first gets a warning. If they don't stop, cyber police proceed to punish them.
What is the punishment? Restricting the access to social media platforms thus limiting their possibility to bully someone online again. It might be temporary and limited to only certain platforms, but it might be permanent.
The severity of restriction would depend on the severity of the bullying. If the bully got out of their way to track the person and bother them again even after the victim blocked them, deleted/changed their profile(s), the bully would also be tracked even if they tried changing profiles, devices, IP addresses, etc. The virtual police would go out of their way to pin the outlaw down (the invasion of privacy for the invasion of privacy).
All this could be sponsored by international human rights agencies, such as the fund for global human rights.
Vigilantes. If, however, the official and lawful version of this wouldn't work for one reason or another, an alternative could be specialized groups of individuals that would operate similarly to the Anonymous collective, just in this case on a narrower scope. Both volunteering and paid cases are possible. I imagine someone might be willing to pay to get rid of an unwanted person online.
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