Kinda meta advice, but I'd be careful about converting your hobbies into paid gigs. It's a great way to make yourself hate your hobby, especially when it turns out it's not very lucrative and the customers are assholes. I learned this the hard way with photography.
People who advocate "hustle culture" tend to not have very lucrative main jobs, or no upward mobility in their current role. So they look for weird "hacks" to make a few bucks on the side, like drop-shipping garbage or starting some weird self-help YouTube channel. In the world of engineering, I think it's way more useful to focus on your core skillset and learn new things around that.
That said, boringcashcow.com has inspired me to try to come up with a simple programming project that could turn over 4 figures a month. It made me realize in software you can just go for base hits, not home runs, and still make plenty of money.