What type of growth should I expect after launch?

We are 10 months into our first startup journey. We launched our product last week. We got 15+ sign-ups so far. One user who ran into some bugs but enjoying the product so far. The signs seem encouraging.

My co-founder has been without a corporate job for a little over a yar and burning through savings. Assuming 30% profit margin and $15 subscription, we would need over 4k paid customers to even come close to what a corporate job would pay. I'm not sure what we could do to achieve such growth.

Should we consider fund-raising?