I have to guess what features of mine are useful to share, which I've proven to be less than 50% effective at in the past.

Let's see, what features have I seen come in handy ...

The philosophical positions you hold would be good; helps stop people assuming you hold opinions you don't.

Some people might like to know roughly where you are, both in case they need to talk about something that differs between nations or you live near them and they can rope you into attending meetups.

If you have any areas of expertise/qualifications, people who seek knowledge on those topics (for whatever purpose) would know they can ask you and get the mainstream position on things. For example, people with any training in physics will be treated as evidence in debates over the many-worlds interpretation of quantum mechanics. This could be a double-edged sword, though, in theory.

An additional issue is that I'm skilled at being deliberately inflammatory or conciliatory. Good enough that I sometimes do it by accident.

Hmm. Does this conciliatory ability extend to sacrificing your interests? Because if not, it sounds like a handy minor superpower.