“My product is so boring that I can’t create compelling content around it.”
You don’t have to talk about the concept of content marketing for very long before you run headlong into this statement. It’s usually someone who has been at the same company a long time. Sometimes even the founder.
You’re right. You never should have taken the job of promoting it, because you’re doomed to fail. Give up now and start sending out resumes to apply for jobs listed in your local newspaper.