Dear Sir,
I am very pleased to write this proposal to you, cause this is my area of expertise and I am a talented freelancer.
My name is Joel, I am a social media marketer, graphic designer and researcher.
I can promote your t-shirts in different platforms as I have some e-commerce site that can be of interest to you.
I have done Instagram marketing, facebook marketing and posting, and Twitter posting, I can increase your sales by designing graphical posts online for you to help trend your product on all social media outlets.
I assure you, you will get sales.
looking forward to hearing from you soon.
Sincerely,
Joel.