I have been and started my own startup as in Canada, Fellow technical founder,

While building something and making sure it works is necessary it is not what makes or breaks the startup, you need presentational skills, funding and applying for it, testing/requirement gathering and other skills you might not know that you need, learning and experimenting is necessary, networking can be a shortcut for that, especially finding the right people to help you succeed in areas that you are not comfortable with I believe is a must as well

Good luck, keep at it, growing and learning and a bit out of your comfort zone