first you must search new coming ptc sites daily with free bonus cash in PB. then you advertise your referral link in that site for free. this is one method
second one is tell your friends about this, but this method is not much successful because we will call them everyday and tell them to click or do tasks...
next one advertise in your fb account with your payment proofs. also in other social media networks..
also search in the net for free advertising job sites without signup require and place your ad in that site..
try to post in other ptc sites forum ( please not that dont spam others forum, you will post if their is a topic under the forum " everything else" or "General talk" or something related to communicate with others with out spam the forum.
sorry for my bad english dears ... hope you guys understood what i said..
THANK YOU