Thanks
I'm investing real money into advertising but I think the best and cheaper way is to make a personal website, your own domain , not rotator nor free hosting, where you can promote ref links from different faucets ,also some random news from bitcoin may increase traffic.
Also renting a banner space on your website might increase the chance of getting some extra satoshi. Just don't be greedy as the most advertising platforms are . (for example on CoinAd, minimum advertising purchase is 0.05 BTC thats why i will never purchase banner impressions on their website because forces me to buy to much and i can't afford or it's not worth it because the referrals become inactive so fast).