Welcome to MC!
If you just switch to the test c 250mg with 100mg npp, it wouldn't be much of a cycle. I'd keep the TRT along with the cycle. I've been on TRT for 18 years, and when I do a cycle, I do my TRT dose in addition to the cycle I want to do because technically, the TRT is a substitute for your body's testosterone, and I want that in addition to my cycle. I usually plan the cycle accordingly so I don't do too much test. PCT is a little different. Mostly all you need to do is keep estrogen in check with an AI because once you come off cycle, you just go back to the TRT dose which is again a substitute for your body's testosterone so there's nothing to "bring back."
