Just like you, I quit my day job in my early 30s, and have not looked back since. Have founded a dozen companies in the meantime and am currently having the best financial year of my 15 year solo-founder career.
My advice is, hang in there. If you like what you are doing persist and adapt. My best product thus far is an API I built to support my original business plan. The original product I tried to build is long dead.
All the best. e.