Building a niche fantasy football web app, don't know how to market the waitlist
I'm building a niche fantasy football league extender web app that turns private fantasy leagues into a weekly news sports publication about the managers in the leagues to make fantasy football more exciting, it's called League Desk.
The only marketing I've been able to do successfully is post the idea in reddit threads to get around 120 leagues signed up to the waitlist. Beyond this, I have no idea what to do to get this out there. Does anybody have any experience with niche apps and how to market them to the desired audience? I've tried posting on tik tok/insta but starting out with 0 followers you don't really get many views, and if you do get views who knows if it's a fantasy football player.
I have 0 experience with marketing, or with SaaS in general.