Do you have any bloodwork indicating it was due to primary or secondary hypogonadism that you did not recover very well?
If I had to go off and had not been using hCG I would personally do something like;
Last test inject and immediately start 1000-1500 iu hCG eod for 3 to 4 weeks, then followed by 6-8 weeks of 25 mg clomiphene and draw blood for at bare minimum LH and Total Testosterone. If those values are well within range stop clomid and draw blood again after 4 weeks to see how it is holding up without the stimulus of clomiphene.
If testosterone is low but LH is ok/high, your testes are not responding to the LH the pituitary aka primary hypogonadism -> another couple weeks of high dose hCG.
If testosterone and LH are both low, your pituitary is not responding to low test environment aka secondary hypogonadism -> extend clomiphene couple weeks and try again.
This...exactly this. If I was going to go off test for good this is a solid way to do it.
I came off for about 7 months to have a kid and blasted HCG and HMG. I was up to 2,000iu of HCG EOD at one point. The more I took the higher my test levels and sperm count rose. That said, I was not going to recover my test levels. Even trying clomid after to "see what would happen" my test levels dropped under 300. After over a decade of trt it was great to get my sperm count up and wife pregnant but I'm not ever going to recover...epecially not at the age of 39 and close to 40.