Credit Card Repayment to Lower Very High rate APR?

Credit Card Repayment to Lower Very High rate APR?
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#1

Hello, I am finding my credit card APR rate very high…Would like to lower the APR rate…is it possible to pay lower interest…to around less than 10% APR…? will i have to comprise on my interest free period and repayment amount ?

any best online calculator to calculate for the same ?

Please suggest…

Thanks!
Silas