I'll say that the key thing to focus on, beyond solving a problem people will pay for, is distribution. The more concretely you can identify who the customer is

I'll say that the key thing to focus on, beyond solving a problem people will pay for, is distribution. The more concretely you can identify who the customer is, how you will get in front of them, why they will buy something now instead of waiting, how it fits into their budget, etc., the more likely it is to work.