Try launching on Hackernews, product hunt, indie Hacker, email some creator (with large following to try it out), try doing it in AppSumo, Upload a video of it

Try launching on Hackernews, product hunt, indie Hacker, email some creator (with large following to try it out), try doing it in AppSumo, Upload a video of it on youtube. These are just top of my head. I am sure there would be many