That's the only real solution. All of those people who are hassling you now, will be hassling somebody else in the future. I hope that the "popular forum" you mention isn't something that's vital to your life; if it isn't then abandon it. If it is, it's a more interesting question.
If you need to continue to participate in that forum, I would suggest you just be yourself. Say what you believe, and don't get too fussy about it.
I've heard from a lot of women who participate in public fora that this kind of abuse is not just commonplace, it's ubiquitous. You might also think of the 34,000,000 people doxxed last month. It's just a common thing, it's going to happen to everybody sooner or later.