(Read to go along with a webinar presented by the author, though it was technically not required due to shipping delays.)

With the usual caveat that you will only ever get as much out of personal development books as you are willing to accept, I found this helpful as an introvert and what Wilding calls a Sensitive Striver. It's for a different demographic than your typical productivity-culture read, so there are concepts and concrete exercises for situations ranging from setting broad life goals (or, like, determining your purpose/ guiding principles in life) to calming yourself down when your emotions run high.