I try to enrich articles of my interest area, scrutinize IP edits for potential vandalism, sometimes participate in discussions at Tea House and AfD.
Sometimes I write articles. I have written only one though till date.
Wikipedia is a place where volunteer editors contribute. There is a detailed policy which guides on how disclosed paid editing is acceptable. I think undisclosed paid editing is an evil which needs to be eliminated. I remain vigilant to help to identify undisclosed paid editing.