I think your definition of "meaningful" might need to be revisited. It seems it was forged from the perspective of a younger self whose understanding of what w

I think your definition of "meaningful" might need to be revisited. It seems it was forged from the perspective of a younger self whose understanding of what was likely or even possible was ungrounded. You've now adjusted somewhat to the new reality but the sense of what would really be valuable is stuck in the past. It's ok to, and even necessary, to adjust your sense of what's valuable and meaningful. Yes, you probably won't make world scale changes, but that doesn't mean the more ordinary things one can do to serve others is meaningless. It's just different meaning. There's a book, Ordinary by Michael Horton, the first two chapters of which were instrumental in helping me make a transition like this. That book is coming from a Christian worldview so some will object to that perspective. Unfortunately I don't know of anything like it from a secular perspective that I could recommend.