This is why I use many different usernames, I must have used maybe three dozen different ones by now. The only time I use the same username is for games because I want people to know what other games I play.
My opsec is pretty awful but I at least try to not be "simply type in the username I always use into google or some tool on GitHub" bad. I at least want somebody to have to use a few hours or pay a data broker to reveal all my secrets because my bet is that nobody cares about me enough to do that.