According to the following if you cancel your store in the last month of the subscription you will receive the store benefits until the end of the month. You are not terminating early so there shouldn't be an early termination fee. Starting on Sept 1 you will be charged the non store fvf.
Your subscribtion is paid until the end of August. If your subscription started in September 2023 (verify!) and you cancel now, you will be not charged any early cancellation fee.