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Existential Psychotherapy by Irvin D. Yalom

This book originally was for therapists, but later it got very popular and simplified for the common reader. I think it helps better than anything if you want to grow your soft skills. Because it does not have some generic advice on common life scenarios. It dives deep into the root cause of many issues any conscious living being will have. I find the mirror it holds to your face very healing for a lot of issues.