Do you know a good strategy to increase faucet satoshis (300-500) to couple thousand?
First of all you can't withdraw your 500 satoshis from faucet sites. 
All faucet websites have some minimal amount to withdraw from their websites but to reach that minimum value we need tons of hours,so doing faucets are really wasting your times.So if you want to gamble you must have some money to bet and there is no way to increase it,only was is to win the game and get the rewards.