How do you all find a solid business cofounder?

I'm a technical founder. I've been doing user interviews, cold outreach, and now have my MVP built. I'm finding that I just don't have enough time in my day to do everything I need to do.

My past experiences trying to find a cofounder have felt like a waste of time because the business founder would often talk a good game but ultimately be full of hot air. How do folks filter these people out? How do you all find a solid business cofounder?