When I was training hard and at my fastest a few years ago now, I was trialling High Fat Low Carb. Kind of Keto but not really adhering to the hard core ketosis principles, just having lots of proteins and fats and keeping my carbs/sugars low. I guess you could say it worked as I got stronger and faster and a LOT lighter while doing it.
My biggest take away from it though was that I didn't need protein supps to perform/recover. For a long time I found that proteins shakes were a massive help to my recovery. Once I went to HFLC I was almost finished a batch of protein powder and it was off season so I didn't bother getting any more for a while. That was when I found that I had zero recovery issues when on HFLC. Once I came closer to the race season I was training harder and more often and I had zero residual soreness the next day