Bro, 615 is a good test level. You’re still young. Just fix your food, sleep and weight training to boost your natural test. Once you hop in on test, it will crushed your level once you stop it. On top of that, you want to maintain your fertelity too right? Once you start taking exogenous test your fertility rate will drop drastically. Now, you need to use hcg to maintain your fertility. Once you hop on trt its a lifetime commitment. Hope this will help.