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.
To be clear, it's not Jagex you're competing with. It's the 20+ other indie MMO solo developers who are trying to do the same thing as you, including but not limited to: RetroMMO, New Eden, Valorbound, Carth, Eterspire, Omuri, Shadefell, Cookie Dragon, Cinis, Cinderstone, Legends of Etherell, Legendarium, Mirage Realms, Aether Story, Ethyrial, and so on. There's more that come and go every month.
Unfortunately, the #1 lesson that I've learned is that while nostalgia gets some reception, there's a reason no big companies are really making MMOs, even at a smaller scale. There's just not that large a viable market for them.
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.