Don't contribute anything relevant in web forums
events.ccc.de
events.ccc.de
Why do people post on forums? Because that's where the people are!
Nothing's stopping you from copying your contributions over to your personal blog.
But if you're worried about longevity, your personal site is also subject to the same pressures as the larger ones. Your domain might expire, your host might kick you off, the law might come after you.
Blog post from 2020: https://karl-voit.at/2020/10/23/avoid-web-forums/