1. You should use some antibot for example once in a few minutes user must pass an url shortener - additional money for you (try zap, uclick, 1link and others)
2. Invest in paid domain, it will add you more trust.
3. You should register with FaucetHub - addditional promotion and cheap payouts!
4. Make it more professional! Design should be better, add some sections, graphics, style!
5. Cooldown decreasing short links? When user pass short link he decreases cooldown by 1.
I think it's good list to start with. What do you think?
