Paid marketing doesn't work in my experience. Social media is cheap. I've had an app get thousands of views based on a reddit post, and not one person (literally 0) bothered to click outside of the page (i.e. were curious what app this is). Social media is a false sense of validation, even if you get a hit.
Direct sales is the only thing that I found that works consistently. Get in front of anyone in this organization.
My guess is you're trying to do too direct so you send a spammy email telling them how great your product is. Don't do that. Don't try to sell them anything. Don't even tell them you have a product. Just get them on a zoom call and ask them what they do now and why it sucks. People are much more receptive to take a call and tell you about what they do or their problems than they are to hear a sales pitch.