A shame to see this downvoted. I presume its because of the "Very few people are capable of this" bit?

I can't stress this point enough. Learn to write product plans. Documentation that delights people being onboarded to new systems is always appreciated, often by yourself months -- or years -- later. Well written bug reports, feature request, and such can easily cut developer turn-around time in half.

And to add one more thing: humility. Be the type of person nobody >needs< to listen to because they can so clearly follow you by example.