I enjoyed reading this book by Benjamin Todd: 80,000 Hours: How to Have a Fulfilling Career That Does Good.
The TL;DR is: To find a fulfilling career, get good at skills that help others. Passion will then follow, not the other way around.
Here’s one quote on motivation that I loved.
"Your first job search may be one of the hardest things you've ever done . You may have never been rejected thirty times in a row before . It can involve months of work . And you may have to do most of it alone . It can make online dating look easy . This means you'll need to throw every motivational technique out there at it ."