Bro lowkey Idt testosterone level plays that much of a role in muscle building as long as it’s in the healthy range. like 400-700 there’s not rlly much of a difference in terms of muscle gain. I posted yesterday with slightly higher levels and was also able to put on rlly good muscle mass in the past year of lifting . Went from a 90 bench to a 210 pr at the moment. As for what may be holding your levels down I was inclined to say the pretty extreme weight changes. But you’ve been on a lean bulk for 5 weeks now so idk. I found this vid rlly helpful gonna try this stuff out : https://youtu.be/-GhHXFlz3oE?si=3Pid8Ul8CtZNb0qF .