How do you find a business/sales cofounder for your saas?

I'm the founder of a legal tech saas, that is due to launch end of jan. I am heading development and product. I am full-time, and am leading a team of 3 others: 1 part-time dev, 1 designer/product manager, and 1 part-time salesperson. My full-time salesperson had to leave for his new grad job so am looking for another. My part-time salesperson can only do half of the calling I hope to do, maybe even a quarter. The problem is that we got most success in getting demos and therefore waitlist signups, by cold calling. But I cannot spend all day cold calling, while also heading development and product. How do you guys find someone who can handles sales and marekting?