How would you get in touch with startup founders to share your product?

Trying to scale https://get.mymfa.io and I feel that companies that could benefit the most from the service would be: 1) small companies building a QA team (or outsourcing it) 2) startups (fintechs) getting ready to submit their app to the App Store with a Two-Factor Authentication mechanism.

I am having a hard time trying to figure out a channel to communicate efficiently to potential customers.

Thank you very much in advance for your time!