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You need to test a lot of things. The ROI does not only depends on the source, but also on your landingspage. You should do some split runs to test what is working best for you. You should mix some traffic traffic sources with different landingspages and also type of traffic. If you have found the good ROI then you can step on the gas :-)
Good luck!
BTW US is a tough market, I would recommend europe.
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