I've joined the Twenty Year Society of Wikipedia editors. I've written 418 articles, I've served on the Wikimedia Foundation Board, fixed typos, added citations, added photos of people who should have them, and added a lot of fair use and public domain content there and on Wikimedia Commons.
My favorite things I've done are adding photos of BIPOC librarians, creating the stadium organist and state library association templates, and defending articles about trans folks from pronoun vandalism.