As other said, just cycle. This doesn't mean you have to come off completely (because you said your balls don't work anymore, which I am familiar with) because it wouldn't make any sense - you would feel like shit, no libido, lose all gains + it wouldn't be healthy at all. very low test is a much bigger issue than a bit higher dose for TRT!!
so what I mean by cycling - 3-4 months 100mg/wk (trt dose), 2 months 300+ , .. repeat