And also, the more your startup gains traction and the more your product is built out, the higher your chances of getting into YC. I'd also like to advise agai

And also, the more your startup gains traction and the more your product is built out, the higher your chances of getting into YC. I'd also like to advise against finding a random cofounder you don't know well. YC actively tries to filter out those kinds of matchups (for good reason); I suspect it might hurt your chances more.