Realistically it's more a matter of security through obscurity, ensuring that no one is sufficiently motivated to try to dox you. You just need to slip up once, or a service you used have an unfortunate data breach, and then your information is public. I have gone through multiple usernames over the years and have gotten better at not adding private info, and maintain different usernames for stuff connected to my legal identity and stuff that must never be, with throwaway accounts for things that may end up leaning one way or another. My username here is a common word in German - a language I don't speak well - which should make it harder to find me unless you figure out what other services I use it at.
