Harassed - online, tell them to get over it. In person (i.e. someone is actually harassing you in real life), call the police because we already have laws against that.
Doxxed - If someone posts actual protected information, then sue them if you can. If someone just posts public information, then I don't see what the issue is.
Revenge-porned - If someone makes secret recordings of someone without their permission in a situation where that person would reasonably expect privacy, then that should be a crime. If someone makes a sex tape with someone willingly and hands ownership/control of said tape to that person, then you should have to live with the consequences of your actions. Don't make sex tapes. ¯\_(ツ)_/¯
Go to the police, because most states have laws against revenge porn: https://en.wikipedia.org/wiki/Revenge_porn#United_States
The problem I believe is that people don't understand that freedom and security not only don't go hand-in-hand, but they are often diametrically opposed. We can do something about direct or indirect inciting of violence. Being bullied, trolled, harassed and doxxed may be illegal if it can be shown that violence toward an individual or a group was the specific intent. But offending someone is not enough, at least not in the U.S.
Other place, certainly. Many places have laws against insulting another person, offending their dignity or decorum <-- I'm literally quoting.
However, America also has a long ways to go with regard to freedom of speech.
In 2022, the U.S. ranked 42nd in the "Reporters Without Borders Press Freedom Index"
Very sad.