I imagine my practices are similar to many other HN readers. I follow some privacy best practices but don't generally seek anonymity online. You can google me and find my social media accounts, some articles I've written or for which I was interviewed, and figure out what city I live in. That is to say, my online persona is not entirely locked down.
Let's say I wanted to prevent myself from being doxxed. What steps could I take to make it more difficult?
2) Start adopting new pseudonyms. Use a different one on every site, and a password keeper to help you stay logged in. If you happen to forget, don't worry. Treat every account as disposable. These are not "you". This is not "your brand". These are merely tools that allow to into a walled garden party wearing the mask of anonymity.
3) Do not mix your two online personas. Keep your politics, jokes, and personality in your pseudononymous accounts. Keep your boring safe opinions and pictures of dogs in your primary account. Don't talk about anything in your real life in your pseudonymous accounts, even the weather. Reserve that kind of discussion for in-person friends only. If you make a mistake, just delete the account and make a new one.