But there lies the problem. You are deeply attached with your ideas and product. You said yourself, you spent 19 years changing the world in this area but not satisfied. It makes sense why you would point to marketing as being the fault. I hope you can see it from a passerby's point of view and not take offense at what is being said like the other guy below reacted.
When I spent a good chunk of my 20s writing software that I thought would change the world, I was defensive, had a huge ego ("My idea changed the industry and I feel like others with VC money have stolen the lime light"), and just refused to let things fail.
I admire that you've found happiness in life. There's more to life then just running a business and making money. I think it's definitely ignored in our world.