Trying to change my testosterone level without TRT at 24 yo

[christophert]

So I recently got 24 years old and I decided to check my testosterone levels. They were below the minimum acceptable norm - 8.9 nanomole per liter. I started going to gym 3-4 times a week and my testosterone climbed over this norm, now it is 9.84 nanomole per liter. My test result sheet says these are standards set up by ISSAM. I contacted an endocrinologist and she told me I have to check if I have any brain tumors, I did it and I have none. Now she says that I likely have to pass medical screening that will last for about 2 weeks, I will also have to give some samples of blood as well as anything else they require me to give them. She suspects some kind of DNA damage, even though she hinted that DNA damage happens rarely. But now I am in a different country for 1 year, and I won't be able to get back to the same doctor, or even have adequate level of medicine where I am currently in. So I think I will have to significantly change my lifestyle now: going to gym everyday for at least 3 hours, sleeping heathily, eating well and getting on testosterone booster supplements. And see if it changes my testosterone level before I can go to the same doctor in 1 year.

I suspect that my testosterone level is so low because I've had sedentary lifestyle for my entire life, including teenage years. I never did any sports or resistance training up until a year ago. I think this is the only real cause of my problem with testosterone, since my body thinks "well this guy only eats, sits, and sleeps, he doesn't need a lot of testosterone". And DNA damage is something that sounds as an unlikely cause to me.

Is it possible that I unknowingly and permanently ruined my hormonal levels when I was younger, and I will never have healthy testosterone levels no matter what I do now? I don't want to enroll into TRT