Testosterone is tricky, for many reasons some of which have been outlined in this thread already.
The major issue is that the range for total T on a blood panel is very, very wide. Some men are fine at levels below 500, some don’t really feel good until their levels get into the 800-900 range.
I’m on TRT myself with a great doc. Blood work is great so you know where you’re at, but you really should go by feel. For me the biggest benefits have been an overall increase in energy throughout the day. Pre TRT, I would be passing out at the dinner table around 6 PM while my son was trying to talk with me. No bueno.
Another benefit is the return of erections during sleep and thus morning wood. Overall libido is up in general.
So for me, TRT was the right move.
Otherwise, doing everything you can to optimize your nutrition, supplementation, and *sleep* should be a priority regardless. Especially vitamin D. And sleep. :)