Optimizing your marketing funnel starts with mapping content.
STEP 1 - Understand your buyer persona's decision process. Who's involved and what role do they play?
Get to really know your buyer persona. Interview customers who fit that particular persona, talk to the sales reps who closed the deals. Figure out what information the customer was looking for initially and how and why her information needs changed over time. Assuming you have the proper analytics in place that have tracked your customer's actions on your website from day 1, and how she responded to your lead nurturing efforts, you should be able to easily glean the details of her quest for information, the timing — all the different steps she went through and why.