Worked on Sesamecall.com for about a year. It was so painful, grinding and trying to get users, run experiments.
Learned:
I want to make a sustainable community, not be VC baked or be poor
I want to work on something solo. I don't have any needs for a cofounder since I can do it all myself -- emails, coding, etc. Don't have a need for complimentary skillset since mine is pretty balanced. If I need it, I'll know. But I can't seek cofounders out of loneliness anymore.