Instead of telling people to monetize their hobbies, I'm gonna start telling people to hobbitize their professions:

• Man, you are such a good contractor negotiator. You would kill it at boardgames.
• Oh wow, your art is so beautiful! You should totally leave it in an unmarked box in the woods!
• Dude with those excel skills you could set up a kick-ass pan-franchise multi-generational interconnected fanfiction webcomic
• Science communication you say? Have you considered maybe running shitpost blog with that?
• Phenomenal closing arguments! You gotta get into DMing!
• That is a great flowchart. You've thought of everything. Let me tell you about Werewolf.