Of course, if you're going the paid ad route, you could also use Facebook and Google re-targeting to keep that awareness and interest level high. For example, if you've ever noticed after leaving a particular website, that you begin to see their ad everywhere, there's a particular reason for that. Especially if they've already entered your sales funnel, this is a very powerful way to get them to act.
There’s a better solution: It's not impossible with sales funnel management automation. Set up your system with the response you want, and it will be ready to send it immediately to any interested prospect—even the one who contacts you on Saturday at 3 am. As captured leads pass down the funnel, your sales automation platform can send added personalized emails that are just right for each moment.