You might be able to negotiate a lower interest rate with your card issuer, but you most likely won’t get an issuer to lower your rate to 0%. Issuers typically reserve 0% intro offers for new customers, and these offers are only temporary.
If you do decide to negotiate a lower rate, your odds of success will be higher if you have a history of good credit habits. The issuer, however, is under no obligation to lower your rate.