[hirokib]

Honestly for us (https://butterflylabs.gitlab.io/api-documentation) we just cold emailed a large number of folks we thought were our target demographic. Basically LinkedIn, look for product managers who are mid-level, and reach out. We got our first two customers from there on our MVP. The thing to keep in mind is if your MVP would solve a real problem, usually folks will be willing to try your solution because it's something they really need. Otherwise your product is just a nice to have and you're probably close to but not quite hitting the right problem spot.