I'm looking for a technical partner. I think there's no secret recipe, but I especially like the answers below that suggest to be methodical about finding people and assume most won't work out due to life circumstances, timing, not liking each other, and more.
I also have gotten some good traction from writing this post: https://blog.usejournal.com/im-looking-for-a-technical-partn..., maybe you want to do something similar in the inverse?