The point of a startup is to make usable technology for others. When you make software, you have to watch at least 10 people use it. Sit next to them and say absolutely nothing. Force yourself to marinate in the failure of your product design. Every version 1 of any software will be absolutely destroyed by first interaction with users. You need to watch your new creation be absolutely misunderstood by users to reform version 1 into the one that actually works. There is only one path: figuring out where the sharp edges, the places people get caught, the assumptions you make as a builder that turn out to be wrong, and then relentlessly sanding it down so that anyone can use it. That is good design. That is the key to a good product. There is no shortcut for this. WATCH USERS AND CRINGE AND THEN FIX IT. SAND DOWN THE EDGES.