Part of what really tipped me off was my energy before and after the gym was much lower than it used to be. Also I would be tired starting around 2 PM in the afternoon, this isn't sleep related as I sleep like a baby, which I am grateful for. Also I never drank coffee or took lots of caffeine so I was perplexed as to why I would just crater in the afternoons.
After starting the treatment I am no longer tired in the afternoons, my mind feels sharper and I can tell I am recalling processing info better. The energy at the gym has improved as well.
There is a range that is considered normal testosterone except that range is HUGE, my results were at the very low end of that spectrum.
Part of the plan I am on I get tested every month for the first 3 months then every 3 months there after.
https://www.everlywell.com/products/testosterone-test/
(No affiliation, not an affiliate link)
Honest question - how much exercise were you getting before you went to testosterone therapy?
The reason I ask is because of the studies that have shown that the decline in testosterone associated with aging is because of poor health, not age. Example:
https://www.sciencedaily.com/releases/2011/06/110607121129.h...
I am in the next decade after you and have noticed no decline. I do heavy weight lifting three days per week and burn about 1,000 calories per day with cardio. That seems to be a sweet spot - too little exercise or too much and your testosterone will take a hit. Rubbish diet will not help though either.