Question that helped me the most (I'm a dev) is whether I wanted to build a product or a business. Without initially realizing it, I almost always wanted to build a product. I delayed talking to customers and figuring out financials of the business. Instead, I was coding like there was no tomorrow. At some point I had to start doing everything else that wasn't development. It was painful, I didn't enjoy it, I didn't get immediate results, and I gave it up. This cycle happened a couple of times.
Many years later I realized that I actually wanted a product, not a business,
i.e. there would be no business for me if the product wasn't immediately successful. If I was building something for personal use - that would be fine, but if my goal was to start generating income, then I should have focused on building a business rather than building a product I fell in love with.
Back to you. If I understood you correctly, you're convinced there's a customer for your non-existent product even though you haven't sold it yet. So it sounds to me like you're in love with your product and you don't want a business without it. Your business will most likely fail because you don't give it time and energy, simple as that.
"No Stan, you're wrong, I want a business"
Great, start building one. Businesses need to create value for customers (in most cases such value also generates revenue). You mentioned existing tools are as good as your MVP, but people need coaching - great, offer them coaching first. Figure out the easiest way of solving their problems, the shortest path to revenue. You might come to a conclusion that building a product is actually the hardest way of solving their problems (or maybe not). If you find a way to integrate your product into a business - great, but I wouldn't recommend doing it the other way around,
i.e. integrating your business into a product because you'll end up with a product, not a business.
Btw, you don't have to abandon building your product, you probably enjoy doing it anyway. But you need to realize it's a hobby until you have customers. Hobbies are great, they make us happy. But if you want a business, you should probably spend more time on the business rather than a hobby.