My suggestion is instead of searching for an idea to build for the domain sell it to someone (you should be able to get a large sum of money for it) then take that money purchase a domain that correlates to an idea you are passionate about.
I think this route has two major reasons why it is a better idea than chasing an idea to fi into the domain.
#1) If your passionate about the idea you are more likely to pursue it and stick with it. You'll be more excited to go to work each day. You'l be wiling to take the ups and downs in stride.
#2) You already have in a sense an angel round from yourself. This eliminates the pressure of financing at first and allows you to focus on really knocking it out of the park.
How did you come about that name, did you buy it years ago, acquire it recently?