If you were in your early 20's, maybe it would be reasonable to suggest that you recalibrate your plans and give it another crack? But at 37, after 2 decades'

If you were in your early 20's, maybe it would be reasonable to suggest that you recalibrate your plans and give it another crack? But at 37, after 2 decades' worth of attempts, with a proposal that (at least from where I'm sitting) sounds like a pet "basket-weaving" project rather than an actual commercial product, I think it's time to admit that maybe you just don't "get it". There's no shame in this. Plenty of people just don't "get" plenty of things and still live fulfilling lives. I'm sure you'd be great employee and provider working for somebody else. Don't deny your wife a family because you want to chase some bullshit dream of being an entrepreneur.