I've tried coming off test twice, ran dr scally hpta restart protocol. Bloodwork after 6 weeks and test levels 50-60, threw in the towel both times and went back on, that was a few years ago, I dont try to come off anymore. Wont say I felt terrible but zero sex drive, lack of strength, fatigue really fast from intense work, no energy.
Seems most fail to restart hpta after a couple years of blasting and cruising, and those that somewhat did were still only putting up low, in lab range numbers after a year, and multiple pct's.
Best of luck to op, I've been where he's at. I still blast and cruise, but blasting for me is 500mg test, usually nothing more.