Thank you!
I think, like you said, a good strategy will be to keep it fun and hobby-like as long as possible. I can definitely see the business-side of it sucking all my time and energy.
I think doing some educational materials will be a worthwhile way to market and gain interest. Community building with something like a Discord server will also help. Competing as a business with something like Jagex is 100x harder than just making a good game.