You could amass quite the collection of books on finding purpose in your life, career planning, and the like. I've read many of them, and many are quite good.
Rather than a book I offered the three fundamental questions:
- How do you define a meaningful life?
- What resources will that definition require?
- What must you do to sustain those resources?
The opportunity for each of us is to craft a life filled with meaning that requires means that are manageable to maintain.