Yes, incorporated keto many times in my life, currently doing carnivore, but stay in Ketosis. I've done keto prior where basically I ate
Meal 1: 6 whole eggs. Meal 2: chicken/avocado Meal 3: whey isolate/almond butter Meal 4: Salmon/broccoli Meal 5: 80/20 ground beef/zucchini made into noodles/low carb organic pasta sauce
Did this and got great results, went carnivore (steak, eggs, raw dairy) and feel even better, I test my ketones with a blood ketone meter.
Tips, electrolytes are absolutely essential, you want at least 7,000mg of sodium a day (not salt sodium), 4,000mg of potassium a day (if you eat plants avocado/spinach, not eating plants potassium chloride supplement), magnesium 500-600mg prior to bed (magnesium bisglycinate is what I recommend).
First week I'd take off lifting all together, just do cardio, help dump the glycogen stores and let your body adjust to ketosis, if you stay on top of your electrolytes you won't get the keto flu.
Prior to lifting make sure to get a good amount of sodium, even recommend 2-5 grams of creatine monohydrate.
KetoSens the meter I use, ideally your ketones should hover around. 0.5-1.5.