I probably ate that little only for the first two or three months. After that it was around 800 cal/day for a few months - and then I was up to around 1000 calories at around 10 months out. I didn't consistently go over 1000 until about the year mark, but WAS consistently over it the second year. Maybe 1000-1200 calories a day. I finally stopped losing weight at 20 months out and gradually increased my calories until I found my sweet spot.
I gained 10 lbs in year 3 (which is very common - and frankly, I needed to - I'd gotten too thin), and then another 10 during the past year (thanks, COVID), which I would like to lose again.
I can maintain if I stay in the 1500-1700 range (that's going to vary for everyone depending on a number of factors).
I never reverted to eating junk. I almost always eat healthy foods - protein, fruit, vegetables, complex carbs (like whole grains). It's not that I NEVER it junk, but on a regular basis or every day, no. And I have to really monitor what I eat because if I go over my safe range too many times in a week, my weight will start heading north. Like Creekimp, if I have a blow out day one day, I'll cut back for a couple of days so that my week will average out.
your sleeve should still work. to lose the weight again, you'll have to ditch the junk and start eating like we were supposed to be eating again - protein first, then veggies. Small servings of fruit or whole grains are also OK. Figure out how many calories you're eating now by tracking for a few days. Then gradually cut back until you get to a range where you're losing again (gradually cutting is easier for ME, anyway - drastic cuts like 500 calories cut at a pop are tough for me - maybe that's not true of everyone). Losing weight the second time around is much slower, but it CAN be done.
and do find a therapist if you need help with your eating issues. Lots of us have used them and find they help.