This forum is not a good place for a lengthy discussion about HRT and all of its implications.
There have been a number of good books,written in the last 12 years, discussing this topic.This book was published three years ago and documents this physicians experience with HRT.I suggest reading this and becoming more informed on this topic,since administering just testosterone is fraught with some serious complications.
Testosterone Replacement Therapy—A Recipe For Success by Dr. John Crisler.
This book could save you years of searching for the right answers.
https://www.amazon.com/Testosterone-Replacement-Therapy-Recipe-Success/dp/0983773947