You need a trial of testosterone replacement therapy. It does not matter what your testosterone "levels" as this tells you nothing.
There is no harm if you try some tantric kriya, or taoist yoga kriya. Just look at Male deer exercise, kegel exercise,Sat kriya in google. Microcosmic orbit, breath to orgasm,.you will find related website through google.You may also search for herbs or fruits which enhance sexual strength. Water melon is top fruit for sexual strength.I read this just recently. This therapy take time, its results are good without any side effects.
A trial of artificial testosterone doesn't sound like a great idea, considering that steroids got me into this position in the first place. And what about the effects on the HPTA?