Find an open-source project that has a react frontend and could use a tour, and create a PR for a nice tour using your library. Be transparent that you're the author of the library and you've done this work to showcase the capabilities of it.
I personally usually dislike that kind of tour and look for the skip button as soon as I can, so I'm not sure what sort of reception you'll see, so be prepared for it to be rejected. But then you can try again somewhere else (without getting spammy)