Optimising your testosterone is just as much knowing what to stay away from as it is knowing what you need in your system for optimal production. We live in a highly estrogenic world and everything from the tap water (mainly glyphosate and flushed/excreted pharmaceuticals) to the plastics you drink and eat from.
T therapy should be your last resort because your T will be dependant on it for the rest of your life. You're much better off producing it naturally.
Start here, it is easy to read and navigate and will provide you many scientific research studies along with the information.
https://www.anabolicmen.com/
Naturally produced testosterone is like the fountain of youth. Because it is naturally produced it follows a positive feedback loop. You will seldom have 'to much' as it gets recycled and reproduced.
My recommendation is finding out what vitamins and minerals will assist you in the production, and what to stay away from. That site will tell you.