At the very least, consider leaving your files up, and granting free permission for others to reuse in their own scenarios. That way you might leave a legacy easily as impressive as the campaigns themselves.
But HeinzG is right. Before you make
any decisions, sleep on it. In fact, let it lie untouched for a few days. Take a small "vacation" away from working on your units and graphics completely, doing something else completely.
Perhaps when you return you will find your enthusiasm have returned... Perhaps you would even consider (re-)starting with something a little less ambitious. Say a single (small) scenario, which really showcases your great terrain and your meticulously designed units in a way that makes even the casual visitor to Slith's site *have* to play with your stuff!
Then you could resume your work on your mega campaign a little bit at a time...
Best of luck.