Likely best to just hire a bunch of hour calls with various people.

For me, hands down best leadgen is doing live talks.

https://Meetup.com events.

Related industry or tech conferences.

Normally you can put in a speaker application + if you're topic is interesting, attendees will vote to allow you to speak.

Speaking to a target rich environment is like fishing with dynamite. You'll bring in a huge haul every time.