You mention that you have a visa. What type of visa do you have?
I suggest that you consult with an immigration attorney about your case.
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Your uncle cannot sponsor you for residency using the Petition for Alien Relative as this is only for immediate relatives such as your spouse, parent, child or sibling. You would need a different path in order to be able to legally enter the US in a non-immigrant or immigrant category. You should consult with an attorney to find out what your options are.
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You may apply for a non-immigrant visa. There are several, such as a visitor's visa, student's visa, investor's visa etc. It's in your best interest to contact an experienced immigration lawyer to discuss which option is the best for you.