Amazing story.
Key takeaways:
Don't run of money.
Don't be afraid to go alone and found the company you wish to create value in the world for.
Believe in yourself, listen to your customers, and don't build a product that isn't being used.
A startup may fail, but that doesn't mean you do. Keep going. Keep understanding your customer, your niche, your community and find ways to bring amazing value to them.
Double down on that, raise money for that value, not an idea of what value your thing, gadget, service, or company could bring.
Thanks for your amazing words, I'm also a co-founder and your words resonated.... :)