how to boost earnings in PTCs without investment?

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hello myLotters! i'm a newbie when it comes to earning well in paid to click sites, and i don't want to invest any on them because i don't have enough experience on how to manage referrals much, although i still can manage to have several rented referrals in sites like neobux. do you have any information that you could spill so that newbies such as i could go a little bit faster in earning more with rented referrals. what could we do to boost earnings without investment, aside from the daily clicks and little-by-little extra earnings from rented referrals?