Hey there! I started with a lower BMI and had lots of success! I am 5’ 5”, started at 209. Within 6mo I was WNL and a year later I was about 145lbs & am happily staying there.
I have actually heard that lower BMI (30-35) has more long term success with the sleeve, in part because folks at that level tend to not have as many food addiction or unhealthy habits. There are some studies going on to demonstrate the success of lower BMI folks, with the hope that eventually insurance will cover lower BMIs more often. (I just eeked in at BMI of 35 at my highest- may have purposefully gained a few to do it.)
IMHO the trick is to track what you eat and have a balanced diet (not another low carb, highly processed fad nonsense diet that’s just going to fail long term.)
So, yes! Lower BMI patients absolutely have a ton of success. And potentially have greater long term success. So go for it! You will do great.