Hello! Can I claim a refund of 30% income tax withholding as non resident alien as my country of residence has no tax treaty with teh U.S.? Appreciate your answer, thanks

I have the dual citizenship (Italian & German), but I live in Costa Rica and I am in a process to get my residence. As I want to start selling on Amazon.com, Amazon would withhold 30% of gross revenue as Costa Rica has no tax treaty with the U.S. Is there any way to avoid this as a European "citizen"? Can I get this 30% refunded in when I file a tax return in the U.S.?