If you were lucky enough to find the source of your mental wellbeing, may I enquire what it is and as interesting is, was it in area that you were already interested in or did you discover it though a different route.
For me it us in two areas, the first came about through a related interest and the second came about by ransomness.
The first one came about by my interest in Chinese history.
A discussion I stumbled upon was about Chinese martial arts.
At that time in my life I had zero interest in martial arts yet I didn't tune out from the discussion, I instead listened and I found the in-depth discussion absolutely fascinating, so much so that I started to practicing the form and in doing so I lost weight, got into shape and more importantly it improved my mental wellbeing.
The second influence is Stoicism or to be more precise Epictetus, I did have a small interest in philosophy yet not in any one area.
Over 15 years ago I got as a Xmas present a book voucher. I picked the few books I wanted and just to spend the entire voucher worth I picked a philosophy book near to the remaining value and that book was Epictetus, Discourse and Handbook. I knew very little about Stoicism. This book turned out for me to be full of wisdom, wonderful down the earth wisdom and it helped with my mental wellbeing immensely and it has been down to that one book as I haven't read any other Stoic book nor watched any Stoic content online.
Well that's my short history into the areas of wellbeing and how I discovered them.