If you do not pass USMLE exams you cannot qualify to apply to US post-graduate medical residency training programs in the US; and you cannot qualify for a medical license to practice medicine in the US.
If you are a US citizen, you may look for an alternative career path other than being a doctor.
If you are not a US citizen, you may look for career opportunities in the country where you are a citizen. There are almost no job opportunities in the US for an international medical graduate who has not completed a US medical residency training program, and does not have a US medical license.