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I work for a local Canadian digital marketing company and we are seeking to expand our client base but are having difficulty with converting potential clients. We do excellent work and get good results across the board for our current customers. That being said, we can't seem to convert new ones at the rate we hope to. I am wondering what we are missing and would really like to see what has worked for others to see if we can augment our approach to be more successful. Any ideas are greatly appreciated! We are currently beating the competition on local SERPs, and rank very well nationally. 
We have run AdWords campaigns, attempted cold-calling, worked with website audits, worked with different sales funnel ideas, social media and done our share of outreach in both online and local communities, among other marketing moves. Tips on these topics are also welcome, because it is possible we just went about it the wrong way.