Ryhia - 55kg, unless you are a very petite person, you can't be far away from your target weight?
Many people find they have a weight sweet spot, as well as a blood sugar sweet spot. Yours couldn't be 55kg?
One thing I would ask to you ask of yourself is if you do go ninja-whatever-way-of-eating, to force off the last x amount of weight, would you be able to maintain that, or would the struggle to lose it simply be replaced by the struggle to keep it off?
Whilst BMI is a very blunt tool indeed, unless we are tiny, super tall, extreme athlete or have other health conditions driving the requirements it is useful as a rule of thumb.
I'm very slight myself, with a low BMI. A coupl of years ago, at a health fair, there was diabetes charity (in this instance not Diabetes UK), doing a sort of know your risk exercise, easuring height, weight, random blood glucose, and other body composition, using a very, very posh scale, with print outs.
Interestingly their suggested "perfect" BMI was around 22.
It was a fun and interesting process to go through as a previously diagnosed T2, in decent shape.