Something fun and interactive. Go have a look at reddit for a few days, and see if something doesn't spark of ideas?
Sell advertising and or merch and monthly upgrades ona viral site. As an example. i'm rebuilding my history site into a gaming and reading experiance, where you explore the village and surrounding areas, and you read scripts about life during that period, isntead of like you would on a blog. You will have limited movement.
I plan to have save game and certain upgrades only available via buymeacoffee so people have to pay a small amount to support the site and continue interacting with it.
Its meant to be an interactive interesting learning experience. Doesn't have to be the most comprehensive in the least time, or the next wikiepdia, just has to be unusual and new and different. As long as its YOUR take on reality then its bound to be different and original. Thats what you need to think of your project like.