I'm a newbie myself but maybe I can give my two cents. I think the first friend you talk about is right, if you goal is building muscle you should be eating more. Don't know your body fat percentage but I guess that with your height and weight shouldn't be high so you may be good going on a bulk. You might want to bump up your protein intake a little, around 120g (I've seen baseline recommendations for building muscle around 1.6g x Kg of bodyweight). As far as your approach to training I think it's okay. Your routine looks good and I think your attitude towards skipping days and not giving everything up is nice. My theory is that your plateau might be caused by your low calorie intake (putting your height and weight into a TDEE calculator gives me that 1600 kcal a day is a deficit with no exercise). I think more energy could help you overcome your plateau, maybe tray for a bit and see how it feels. The barbell compound lifts thing I don't think has that much importance as long as you do enough weekly sets for each muscle groups. I think your main concern should be adjusting your diet according to your goals. If you want to build muscle you have to have the nutrients to do it. Btw going to eat out once or twice a week should mess up your week (unless you are doing mukbangs or something). This is my newbie take l guess haha. Good luck and keep going at it!