GREAT QUESTION! I loved doing trade shows and with our strategies we would get 10% of all the people who attended to sign up at our stand which is unprecedented. We did this WITHOUT any need to give leaflets to people who would just walk past and forget all about you. I have taught this strat...
Well, you'll certainly have a lot of options for where to focus your marketing efforts, since entrepreneurs are a huge market and pretty much everywhere on the web. I'd recommend testing some different social media channels - grow a brand presence on the major networks, and if you have the budge...
To build on what Sarah said - you can also look within channel if you have access to someone with the technical chops. Some ad groups or campaigns could be driving "worst" leads and others could be driving "best" ones. To cut off the channel is throwing the baby out with the bathwater. UTM tag...