I don't think you need professional help with that. Your original accent you picked up because of the people around you. If you are with Japanese you will pick up a Japanese accent. If you are around bangaldesis you'll pick up a South Asian accent. You can simulate the same using the internet

Edit: It might be easy to pick up accents maybe because I know 5 languages and also I'm a teenager and not an adult.

Note : I'm also south Indian who has never been outside the country but I can tell if it's a southern accent or a Midwestern accent or an upper class coastal accent.