Seeking to Lower Triglycerides and Gain Weight

Hello all, I was diagnosed as T2 in Nov. 2024 with an A1C of 12.1. My lipid panel recorded my triglycerides at 700, but no indication of fatty liver from other tests. My A1C is down to 6.2 but I won't get labs for the triglycerides for another 30 days. I'd like to put more focus into that to ensure control.

My issue is that I'm 6'6", 188lbs and can't afford to lose much more weight. I already lost 35lbs of muscle prior to diagnosis. Are there any good food options for both gaining weight and lowering triglycerides, or is exercise the primary contributor? And any other advice for an underweight T2?