The longer you wait in the sales cycle the less enthusiastic they become and the less they see the relevance for what you are selling or the more time they have to solicit others for similar concepts.
It is niche ideas, products and services that are the backbone of large business new growth. If they cannot recognize your value then that means you need to move on because someone else is looking for what you do at this very moment
I suggest you make two investments in reading. Attracting attention is more than simply targeting the right decision makers. You need to deliver a consistent message on how your value proposition will remove client pain or deliver client (increased ROI) gain as a result of your solutions. The mistake that many start-ups make is that they list a variety of features and benefits during the prospecting process. Pick your top benefit(s) (one or two) and consistently deliver this meaningful message to your account targets (decision makers, influencers, stakeholders, etc.) Two books I highly recommend that will assist you in transforming your business are Purple Cow by Seth Godin and Selling the Invisible by Harry Beckwith. Best of luck.
Pick up the phone, stop the email. Tell the person you have to talk to them now, and tell them why they need to meet with you.
Mr. CEO we have this opportunity, and we can save you money, or save your staff time, or improve your bottom line through....and ask for the meeting...if he/she says "I will pass this on to ....", tell them great, I think it would be a great idea if .....was included as well in our meeting, will .... or .... work for you, and .... go for the close again.