What is my purpose, really?

Hi there,
so many good things here!!! I’m struggeling a bit with my purpose. I understand it’s like an “elevator pitch for the whole self”? Something I can go back to when unclear/uncertain? When listening to August’s videos I came up straight ahead with “Change is always possible – but not mandatory”. I want to lead by changing what I want to change in myself (losing 50 pounds being 53 years old), but also encourage to accept what is. Does that make sense or would you recommend to change that (and if so – any ideas?). Thanks!