I had a similar conversation with my surgeon (but about my continued weight loss) & my response was the same: I can only eat what I can physically eat. I added snacks up to 5 a day & yes I felt like I was eating all day long. I still made pretty careful choices & added complex carbs & some more fat. Choosing from: cheese, humus or liverwurst & multigrain crackers, protein bar, yoghurt, fruit, roasted fava or chick peas, chia pudding, nuts, etc. I also use non diet salad dressings, full fat milk, add seeds & beans to meals. I don’t do sweet or breads, pasta, etc. & cook most of what I eat myself. I don’t drink shakes or need multi vitamins.
Sometimes small change or swap in food choices can make big differences. I can only eat 1.5 eggs (approx 10g protein & 235 calories) but I can usually eat a full serve of rolled oats cause I keep it liquidy (make on milk, add seeds). approx 15g protein, 380 calories. No empty calories, lots of nutrients.
My weight loss stopped when I was consuming about 1300 calories (about 18 months after surgery) but I’m not tall, have a smaller frame, am in my mid 50s & not very active. But you're not me & you may need more calories. You have to work out how much food your body needs to function effectively at a weight your happy at while living & enjoying your life how you want.
It just takes time & some need more than others. Took me a good 2 years to get my portion sizes to about recommended sizes for most things. I still snack but about 3 times a day. Not sure how many calories I eat now as I’ve increased my protein intake a little due to an absorption issue (from gall surgery not sleeve surgery).
Just start making small changes, try different things & see how you go & what works for you. It’s the only way.