Too much protein can kick you out of ketosis (or so they say).
I ate a lot of protein (I lift but not extremely heavy) but never got kicked out of ketosis.
I think the secret re: protein is to keep it within the bounds of what you need given your work-out schedule. There are a lot of good rules of thumb online as to how many grams of protein to eat a day given your size and activity.
In other words, balanced macros depending on activity...but mostly fat (since keto is basically a switch of a body's fuel from carbs to fat).
The use of water is also important. When I started Atkins some years ago (it was successful, but I had an unrelated problem and fell off) I was surprised by the amount of veggies in the model "induction" diet -- they were veggies that I ordinarily didn't eat (at least one I'd literally never eaten, despite my advancing years). The ones most of us usually eat tend to be high carb.
I always carry with me some 100-calorie packs of Almonds & Walnuts, 80% Fat Calories.