I have found that there are only 2 ways
Increase the size of said funnel. You want to get to the point where you go from 100 leads to 1,000 and then 10,000 every month. Because if you're only fortunate enough to close 1% of those leads, then you go to 1, 10, and 100 sales per month.
Increase you're skill and execution at each step in the funnel. You must get incrementally better at marketing, cold calling/elevator pitching, networking, demo meetings, closing, asking for referrals and delivery.