The product seems to hit a really important use case (I have created my own SaaS products in the past, and subs, authenticaation, and permissions are huge PITAs).

One suggestion - your homepage copy is very developer oriented and 'feature' oriented, whereas it could be less technical and more benefit-oriented.

I think changing the copy / adjusting the focus could go a long way. See Outseta.com (I have no affiliation to them) for an example of a company that seems to be doing something similar to you but with more benefit-oriented, business/revenue-focused copy.