There are so many out there. But good nutrition, physical fitness, and psychological fitness is not hard to accomplish; it is mostly what you already know. I can recommend some references to use, but I do not subscribe to any particular program.

Mindset

This is a good beginning. Your mindset is critical.

Flourish

Pretty much anything by Martin Seligman is useful.

You have to start with the head. There are so many sources for mindfulness training out there, and it has been so long since I have used any outside resources. Many years ago, I was taught by someone very good, but years before it was even called mindfulness. Use some critical thinking when selecting a resource.

As for physical fitness and nutrition, I don't even know where to begin. There is too much out there. Common sense (which may not be so common) is a good guide. And as I said, you have to experiment and find what works. Just think "whole person", which is life in general. Eat well, get exercise, and have a good, growth mindset. Resilience is important in all aspects of life. I am sorry, but I don't have any particular program to point you to. I did it for myself from what I have learned through life.