I'm a solo developer who has moved from making games to make a free learning app that has a broad scope. Make using blazor wasm + capacitor for android. I originally made this for myself to brush up on my Calculus and Topology etc. But then wanted to learn more and more, now you can learn computer science, programming languages, geography, history, physics, you name it, its probably in there.

One nice thing about the app is it works completely offline, so its great for flights or train journeys when tunnels are cutting your 5g off.

Please give it a go if you want to up your learning!