- Make promotions (like +50% reward -50% claim countdown time for 48 hours!);
- Advertise it on social medias (Twitter, Facebook, Youtube);
- Pay to advertise it on PTC sites for an example (Just do it if your ads networks allow it);
- Create fidelity bonus on your faucet (Who claims everyday have reward increased by X%);
- Create more faucets and make a network.
I think you mentioned already all the means to promote the site. As a suggestion maybe you can increased the bounty or your rate on those faucets.Also,be sure that your faucets site are always filled up.