Don't focus on people who have already made technology choices and are just looking for staff augmentation. Focus on the business value you can create, regardless of the tech stack, and seek out prospects who have the problem you solve, and care more about having the problem solved than about mandating a tech stack. Ideally, you want to be talking to LoB (Line of Business) leaders and executives, more than IT people.…
On the other hand, business people who don't care about their tech stack often have BIG blind spots in their conception of their desired solution, such as IT leaders that will slam the brakes on your solution if it doesn't fit into their vision of the technology world, who come out of the woodwork in the final hour and doom your project after a bunch of incorrect technology choices were made because the business folks neglected to warn you about these folks and their requirements in advance (even if you probe for this sort of thing, because the business folks choose to operate in a fiction where these people don't exist or are easily pacified).