I completely can understand that. We entrepreneurs have such an irrational and excessive belief in our own future prospects that we tend to discount the present

I completely can understand that. We entrepreneurs have such an irrational and excessive belief in our own future prospects that we tend to discount the present, often to our own detriment. I know I've gone down this path before myself which is why I'm giving the advice I'm giving. OP must take care of today, as unsexy as it is, for the long-term to be a possibility. It's a case of one career paying for the other until the second is all that's required.