You should try something new instead of going the old faucet script thing.
Rewarding people in bitcoins is not dying. But rewarding them simply for filling a captcha is always prone to bots.

Maybe if you can create some game or something interesting where people might want to spend time and get rewarded in bitcoins. That can be profitable.

We are creating Mobile games with bitcoin Rewards.  See "Spacey The Bird" in my signature