we are all different, you should do what ‘feels right’ to you but, i think i recall it not being advisable to IF when you first start on keto, something about waiting till you are fat adapted??? first. so i would do a little research about that.
i personally do 18:6 AND OMAD daily and 2-3 protein coffees with 10-14ml of c8 oil in each 95% of the time. works for me but, i did not do so in beginning.
PS: You do need to make sure you get enough calories in you when eating OMAD and fasting, eating too little too often can stall your weight loss.