Balance transfer payback

When is a balance transfer worth it? $1,335

A $8,000 balance at 21.50% APR with a $450 monthly payment creates about $1,335 of interest in year one.

Bottom line

Interest drag should be solved before optimizing rewards.

Rewards are usually worth one to a few percent of spend. Revolving APR can run above twenty percent annually on carried balances.
Next move

Compare payoff speed, balance-transfer fees, and APR resets.

A balance transfer can help only when the fee and payoff timeline beat the interest you would otherwise pay.