If I didn’t have to work for a living, I would do politics and activism.
Politics: most likely local politics, improving the urban planning, making my city not shitty. And then likely some country-wide politics.
Activism: I would, somehow, participate in the effort to fight against authoritarianism and state overreach. I like the idea of creating independent ISPs for the public good. Or tunnels for everyone! The internet should be free - as in, free movement.