Struggling to find a niche to break into

Hi IH!

I am currently working on a profile aggregator site and I am intending for it to be the LinkTree 2.0, with more previews, functions and widgets than simply link buttons.

I am currently at the beta stage and looking for beta users to test out the concept. I initially thought that freelance artists would find this helpful, they do like it but very few actually decided to sign up and join the free beta test.

If you know a niche that could find this helpful? Please let me know so I can test it out.

You can find a demo here https://www.linkdeck.me/demo

Thanks in advance.