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, Twitter. Instagram page management and marketing project in my freelancing career.
I can assure you that I can post your messages of different social media platforms, forums, and other sites perfectly. This will also help you for achieving your goal.
Look forward to working with you.
Best Regards,
Amamul