If you want to try to scale this beyond just yourself, you can also look at various 'market research' type agencies. Tons out there that will literally do customer/SME surveys/interviews for you.

Everything from online, in person, video call, etc. They summarize all the findings and give you detail too if you want it.

I think most of the outreach/lead gen happens via LinkedIn. I'm fairly knowledgeable in my industry vertical and get hit up by these companies literally every day - usually try to do 1 or 2 live interviews a month. Generally they'll pay in the $800-$1200 per hour range for this type of expertise.