Medtech Startup, how do I get users to trust my product?

So I am building an SaMD startup allowing users to scan their hand/skin and get a diagnostic of any symptoms of disease, malnutrition, deficiencies, whatnot, but I can't seem to wrap my head around how to attract users to use my product. How could I possibly get people/users and have high customer retention rates with such a product.

If you want to check it out/give us a star on Github, feel free!
https://github.com/LuxenAI
https://github.com/LuxenAI/Luxen

Our website: https://luxenai.github.io/website/

Still have to put our Github website under a different reroute to a legit domain, that's still underway.

If anyone has any advice (good or bad) or questions, I would love to hear them!