After doing diet, exercise and homeopathic supplements, I finally went to an endocrinologist who told me I needed more sleep, less stress, and also required short term T supplementation to jump start the system working again.   It worked.

I picked the weekly needle in the leg muscle, but there are other delivery methods, like gels.  The problem with weekly is you feel great for a few days and then fall off a cliff as your artificially boosted T levels naturally go down to the baseline of what your body is currently producing, which can be low enough to think and move slowly and feel awful.  

I can say it worked.  May be other successful methods but this one worked.