How do you find business partners for your startups?

This is where we struggle now. We have built and launched an MVP. Now we are at a stage that we are noticing the missing pillars in our team such as a business developer or someone with a deep knowledge of the domain. We need new additions to our team to close these gaps. I think the minimum required conditions are: 1. There should be a trusting relation from the start: then maybe someone from existing friendship network - but what if we don't know anyone with that profile. 2. These people should not ask for money from the start, but should trust in the growth of our company and be happy with the shares. What are your thoughts about it? What other conditions these business partners should meet? And where and how to find them?