You need to show that you are extremely competent at security -- more so than anyone I can hire myself. You also need to show that you care deeply about security.
For example, the fact that you lock SSO behind a paywall says that you don't care about security. Yes, SSO tends to be an enterprise ask, but it's also important for two person companies. I'd suggest changing at least that part to be 10+ SSO users or something like that, and make the first few free.
Also, your response to security reports in this thread is not what I'd want from a security company. Sure, the right way to report these things is via email, but you should still be grateful for the free security audit you got and approach that with a bit more tact.
At least make it look like you care more about security than revenue and adherence to policy.
Good luck, it looks like an interesting product, just make sure you don't turn users off with your security posture.