Curious was there a problem that inspired you to create the website? Could be inspiration to scope down the website focus some, or have an example problem/solution on the front page
In case it's interesting, along this direction there's halfbakery, pg's essay on how to find startup ideas, YC's RFS posts, and more recently the Startup Ideas podcast/youtube channel which features guests sharing ideas they've been thinking about.
Edit: I see you updated the site with example problems, those are great. I could see this being a great structure for collective solution ideation.