For the last 4 weeks, I've been in an accelerator that brought 100 smart people together to ultimately partner up and become co-founders. It's a very interesting model. One I've had in mind for some time now. I've struggled with finding the right co-founder. I longed for the day someone would have the balls to create an accelerator that introduces potential co-founders. That time finally came.
It's called Antler. https://www.antler.co/ 
Antler identifies and invests in exceptional people. They are a  global startup generator and early-stage VC firm that builds groundbreaking technology companies. They believe that it is important to have exceptional people, regardless of their background and geography, work on addressing large global opportunities and challenges. They help solo founders find the right co-founder among 80-100 other carefully selected people who’ve made it through the application process to start building your company. 
I haven't found a co-founder yet, mainly because I am solely focused on mental health. If I was problem agnostic, I'd probably have a better chance of finding someone quicker. But, as you know, I'm trying to solve the access/cost problem in mental health. 
There are tons of smart and interesting people in the cohort and I will be bringing some on the podcast. If you enjoy listening, let us know!
Instagram - @theSoloFounder
Twitter - @theSoloFoundr
Email - theSoloFounder@gmail.com