The last couple have been collectibles marketplaces and quantified self tracking platforms. I think that is my main thesis -- solving problems/making things easier for people through technology, especially in markets where they are not taking advantage of technology much.
Not to be a dick, but that's not really a thesis: there's nothing in need of being proven or disproven. We all know that technology can make things easier for people, and that some industries don't use it much.
Think a little bit more about your own personal reasons for doing something. That's where you'll find a good reason to keep going or not.
Maybe the issue is that markets that don't take advantage of technology much will be slow to adopt new technology (seems like that would be the reason why they have not taken advantage of technology in the first place).
Self-tracking sounds like a cool idea, but I have used self tracking websites and apps before. In my experience, I just get lazy or forget, so I have never used on more than a month. I think it is just too much hassle and most people don't like the inconvenience of having to enter data about themselves. Do you use your own platforms in your daily life?
I agree with andkon about searching for a purpose that is personal. That, in and of itself, would drive you if it were a worthy cause. I'd say pursue an idea to which you would dedicate your entire life (or at least the next ten years, as Sam Altman has said).