I used to be where you are right now, now I'm more chill even though I still use only free and open source software.

But you gotta realize most of doxing doesn't come from corporate side (with several exceptions, Discord for example). It's mostly what you post yourself, and sometimes the metadata (shouldn't concern you much if you just Twitterpost, this is more of a concern if you run website).

VPN and Tor stuff you mention is pure autism, it only makes sense if you're Assange or Snowden lol