Try to include your high-interest credit card debt in your balance transfer. If that’s not possible, look at the regular APR that will apply on any outstanding balance of your balance transfer once the introductory period ends. If it’s lower than the APR of your high-interest rate cards, you may rely on the debt avalanche method and pay them off first. If the regular APR of your balance transfer card is higher than that of your other high-interest rate cards, consider paying off the transferred balance first.