Get approved for a high credit limit by credit card

I WOULD LIKE TO KNOW HOW CAN I GET APPROVE FOR A CREDIT CARD WITH A HIGH LIMIT? I JUST GOT APPROVE FOR A CHEVERON GAS CARD WITH A LIMIT OF $450. I HAVE AN AUTO LOAN FOR $21000 AND A BALANCE LEFT FOR $3700.I HAVE A LINE OF CREDIT FOR $19000 WITH A BALANCE $121. I WOULD LIKE TO APPLY FOR A NEW CREDIT CARD AND GET A HIGH LIMIT. DO YOU KNOW WHO I CAN GO THREW AND GET APPROVE. I HAVE 6 INQUIRES ON MY REPORT SHOWING UP WITH EQUIFAX. MY SCORE IS IN THE 700. ALSO MY SISTER ADD ME TO ONE OF HER CARDS AS AUTHORIZE USER WILL THAT HELP MY SCORE AND BETTER MY CHANCES FOR GETTING APPROVED.

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