It's critical to first define success for oneself. Adopting the definition of "success" from other people is just being a sheep. This takes a lot of self reflection and deep diving. Mindfulness helps. I like the book called 30 Days to Discover Who I Am by Harper Daniels.
Your comment stayed with me and caused me to wonder. Here is one of my favorite audio books, perhaps it may be of some value to you. Many of us think to much, perhaps you truly have something to be pleased with if not content. Peace of mind is truly valuable. I play this book repeatedly and feel it helps me ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-UPsge_vekSQ.htmlfeature=shared. 🙂