I visited at your spinning and earning site and found it much attractive for users , here my suggestion for you to advertise your site at a-ads.com Because this site is not only privacy giving to the publisher and advertiser but also giving advertisement otpion in low budget .Another options to advertise is to get into social media and make your site post at the wall of thigh liked Facebook pages ( contact admin to ask price ) , you can do the same at Twitter like platforms .
Another option to make bitcoin popular platform is this forum , here you should make your own creative signature and put in your signature space .
Hope these will work for you , best of luck .