Recruiting new ideas through traveling, books, trying new experiments is a great exercise to question your old ideas.
There is no absolute truth. There is no “a” book for perfecting your mood, life, or financial situation. If that was the case, only “one” book or “one” vacation place for everyone. Whatever works for someone might work for you for a limited time or indefinitely.
The best way to figure out keep recruiting new ideas continuously and see which one sticks for a longer time.