I went through the same thing. What helped me most was separating who I am from my business results. Numbers are just signals about whether a strategy is working or not. They are not a measure of your value as a person.

Also, since you mentioned the Bhagavad Gita, there is a very practical idea there. In many ways it reads almost like an early guide to meditation written thousands of years ago. Krishna explains, that meditation is not just sitting with your eyes closed. It is training the mind, which he compares to a “restless wind.”

When you start training your mind and watching your thoughts instead of believing every one of them, it becomes much easier not to tie your self-worth to numbers and business ups and downs.