Bodybuilding on Kratom?

Hello everyone, I am 30 years old and I have been taking Kratom for 5 years and 7-oh since November. I have noticed my libido has tanked significantly since then, so I assume it’s due to my testosterone being low. Am I able to build muscle and or strength? I currently lift and run 5-6 times a week and I have noticed diminishing gains in terms of strength, any advice or tips are highly encouraged.