It's said salesmen are always selling themselves; I don't agree. But they're always pretty engaging company.
They taught us that a good salesman can sell anything. But that's hyperbolic; you have to know the product you're selling inside out.
They taught us to sell solutions, not features. That means (as someone said upthread) you're looking for people with problems, and you need to find out what their problems are, so you can help them.
We used to get leads by setting up stalls at exhibitions. I guess your prospects aren't the exhibition-going sort? But they probably gather somewhere; maybe you could go there.
I dropped out of sales because I couldn't cope with the dubious ethics. Not my employer, particularly; but there was an awful ot of politics, we were taught how to commit expenses fraud by our own boss, and everyone was fiddling commission. It wouldn't surprise me at all if brown envelopes exchanged hands.