I don't think you are going to find a nootropic magic bullet here, as much as I enjoy reading posts by devinthayer, and Gamesguru. I'm as guilty as the rest of using "research" into nootropics as a form of procrastination and a way to relieve boredom; especially since, like many here, I am easily bored, with autistic traits, comorbid anxiety, and OCD tendencies. It's hard to find a subject as engrossing, and wide ranging as nootropics!
Instead of turning inward and obsessively chronicling every little fluctuation in mood according to say, taking 30 mg of DXM, I'd encourage you to focus outward on specific goals, projects, or tasks you would like to accomplish as a measurement of your motivation.
I'm sure most of you detest positive thinking platitudes as much as I do, so I'll spare you the "a journey of a thousand miles begins with a single step" hokum, but if a life of eat, sleep, use computer, eat sleep, isn't satisfying to you, as I doubt it would be for anyone, why not make small goals of spending more time interacting socially, or just getting outside?
If you want to justify it in nootropic terms, there are few better, safer, methods of improving general and mental health that going for a walk, or jog in the countryside.
Ultimately though, I'm not sure you have a problem with motivation as much as you have a lack of direction to focus your motivation.
A vague goal of becoming "the richest man in the world" is self-defeating. How do the vast majority of the richest people in the world become rich? They are born with money. How do the others become rich? Usually, they single-mindedly pursue the creation of a product, be it a vacuum cleaner, a book, a social media company etc...without the explicit goal of vast wealth. The wealth is a byproduct. How else? Well, some people get lucky. They invest at the right time in the right company, buy real estate at the right time, or find a vast deposit of oil on their land.
Bottom line is Ephedrine/Guaifenesin, which I DO take when I have a stuffy nose, won't break the eat, computer, sleep, eat, computer cycle.