Hello Sir,
I hope you are doing well.
I have gone through your description and got pretty much ideas of what you want. I think I am the best fit for this project. I have done many Facebook, Instagram page management, and marketing project in my freelancing career. I can assure you that I can promotion the song perfectly. This will also help you for achieving your goal.
Look forward to working with you.
Best Regards,
Amamul