Mediterranean diet.

That's a good diet to be on. It does depend on your goals.

In general as long as you're eating healthy, regularly, and getting food fats in that's the mort important.

It's more about what you avoid. Things like extra sugars, alcohol, fast food, etc. They will still impact your health negatively.

To get the best hormonal result out of TRT, the main thing to avoid would still be large amounts of alcohol. Despite not impacting your Testosterone level as much since you're getting it from injections, high alcohol consumption can tie up portions of your liver for 2-3 days at a time. The same areas that are responsible for filtering out extra Estrogens from your body. That can cause the desired ratio of extra Testosterone to Estrogen to be off from expected values causing your TRT to potentially give less benefits than you'd expect while also slowing your metabolism down.

If you are going to drink heavily, and this is poor advice/personal opinion either way, perhaps clump those days together in a week. That way at least for part of the week your liver is running on full steam.

Also, because testosterone increases nitrogenous uptake in the cells, thereby leading to muscle growth, an increase in protein would benefit any desired hypertrophy.