You are welcome to add biographies, sources or profiles in response to maintenance tags, but I think the path that you're on already is just as valuable, particularly with a limited amount of time.
You're already adding profiles and sources for people in your direct line, people you are likely to have far more reliable information about: your cousins and ancestors. You're learning about sources, categories and tags, and you're building great biographies. Thanks for all your contributions!
We don't want Wikitree to become a chore, hopefully it will stay fun and interesting. That said, I think as Wikitree grows, maintenance tags may become more important. Who knows, Wikitreers might more often be looking for direction to where they can improve profiles in a targeted way. Right now, there are so many different ways to improve Wikitree that tags don't really need to direct our attention, they're just nice to have and interesting to keep an eye on over time.