Gallo de pelea

I've been an athlete all my life. Football, powerlifting, shot put, track. I'm 6 foot 5 and 285 lbs. I've had a lot of health problems in the last 10 years and while I have retained a lot of muscle, I have a giant gut. I am attempting to get down to 215, but I want to have a more muscular physique while I am losing weight. I have been working out steadily for the last 2 years and there has been no difference in muscle mass. I am on insulin also.

I'm not looking for a magic pill and I'm not able to go on TRT. I have gout and I don't think a massive protein diet is helpful for that condition.

My cardio consists of high-intensity walking for 2 miles, that's about it. I want to be healthier and look decent as I near retirement.

I would appreciate any and all advice