How to improve my testosterone level besides weight control?

Hi doctor,

I am a 28 year old male. My height is 5’10”, and weight is 280 lbs. Yes, I know that I am overweight and I am addressing the issue. I recently performed some blood work on myself, so I could have a baseline as I have started a new ketogenic diet. Before 15 days, I ordered a CBC with differential, TSH, lipids panel, CMP, and A1c. The results are as follows (please note that the number in parentheses are the reference range from the laboratory). Hemoglobin A1c - 5.3 (4.8-5.6), TSH - 2.070 (0.450 - 4.500), serum testosterone - 239 (348 - 1197), CBC normal, SED rate - 3 (0-15), Cholesterol total - 214 (100-199), triglycerides - 126 (0-149), HDL - 36 (>39), VLDL - 25 (5-40), LDL - 153 (0-99), CMP normal and serum glucose - 90 (65-99). After I had got these results, I noticed the testosterone was low. I do not have any trouble with erections, though I am not sexually active.

I decided to order additional tests, and the results are as follows. Free testosterone - 11.8 (9.3 - 26.5), total estrogen - 88 (40 - 115) and SHBG - 14.1 (16.5 - 55.9). As you can see, my free testosterone is borderline while my SHBG and serum testosterone are all low. My question is besides losing weight, what can I do to naturally and more efficiently to increase my testosterone? Also, are these results indicative of anything more severe?Thank you for your help. I look forward to reading your answer. It is also important to note that I am not concerned about the lipids as I have reviewed research showing that those on a ketogenic diet can have an initial spike in cholesterol, though long term results outweigh the short term spike.