something important to remember is that if your favorite thing about writing is the worldbuilding, and you never really ever get around to the other bits…
don’t try to write novels. you can’t make money doing it in 2017, unless you really fucking slog it out and devote your life to it. the only reason left to write novels is enjoying it, and if that’s how you write, you’re not gonna really enjoy it that much. if you’ve got a great idea for a particular story, by all means, take a shot. but if you find yourself unable to enjoy the process of writing a linear story, don’t.
be a dungeon master. don’t fight an uphill battle to fit your round creativity into the square hole of novel-writing. you can’t make money DMing either, but by god will you have a fucking blast. it is the absolute dream art of anyone who loves worldbuilding.
you spend hours upon hours fleshing out a world in increasing detail; adding historical figures, cosmology, magic systems, legends, weird beers brewed from weird crops. just, pure worldbuilding. but it all matters, because you’re making this world for people who are going to be actively within it. wrote 200 words on the tavernkeeper’s dog? that would never matter in a novel. in a ttrpg? one of your players is going to ask to pet the tavernkeeper’s dog. and you are going to feel amazing.
and the best part? your writing will always be in demand. it is an uphill battle to get anyone to read a book, let alone get a publisher to publish one.
but GMs? there are literally countless people saying “man, i’d play that ttrpg if only there was someone willing to run it” every day. it is incredibly easy to find an rpg group if you’re looking to GM, because lots of people are scared of doing it. but you, person who has 300 words on the story of why the town blacksmith is afraid of horses? you’ll be amazing.