What are some productive things to do on my phone other than petitions, make music, donating, social networking, and giving advice to others?

Trust I do way more productive off of my phone than what you could imagine.... I’m just looking for more ideas about doing good on my phone. So please don’t give me a vague response like get out and do something off your phone cause I already do that. I want ideas for things on my phone please and thank you.
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