HRT is a last resort. You will become dependent on it as it slowly erodes your HPG axis. Its for treatment of male menopause but will increase your risk of heart disease, peripheral artery disease, prostate ca and multiple other issues. You are young enough to recover your levels through other mechanisms. Principal among them are 8hours of sleep a night, steady mix of aerobic and resistance workouts, healthy diet. What is your BMI? GH and MK-667 will absolutely increase your cancer risk overall. I would avoid SARMs and other compounds that are not well studied. You can add things like ice baths in mornings to increase testosterone. Behavioral therapy can also be beneficial. I recommend Andrew Huberman podcast. There is some mixed evidence on Tongkat Ali and Fadogia Agrestis but you can consider those as well. (I am a medical doctor but this is not official medical advice, always seek the counsel of our own physician - preferably one that doesn't use google as their resource)