You are correct that French is one of the best languages that you can learn. Moreover, you have a good opportunity to learn this language because your neighboring location, Pondicherry, is full of French influences, and you have a lot of options available there. Not only can you learn French, but you can also become a translator, a teacher, or pursue any foreign affairs-related jobs within your area.
So, I suggest you take the opportunity to learn this language and utilize the opportunities as they come. You will also find many native speakers of this language around you in Pondicherry, offering a tremendous scope for you to improve your proficiency in the language.
While you can also consider learning Arabic, Spanish, or other languages, you will be limited to books and may not be able to communicate with anyone in your surroundings. Always remember, if there's a community associated with any language, you can find opportunities there.
Good luck!