Don't worry about your natural test production, it simply isn't happening. Although I would have put you on clomid, nolva, toremifene, naltrexone, or SOMETHING to try and re-start the machine.
200mg a month is not enough. Likely, you need 200mg a week.
Low test can happen for a number of reasons. Myself, I had a burn-out and then my test was low forever. There is no single, easy-to-find cause for this, sorry.