@G.Coldron - a couple of members seem to be asking, from different directions, why you want to gain weight when losing weight might well be why your glucose levels have dropped.
@JITR is a strong advocate of starting with the results of the work that clearly related weight loss with improved blood glucose levels and attributed that to reduction in visceral fat that was interfering with the function of liver and pancreas. Taking that approach leads to the idea that controlling body weight is sensible, and that keeping track of BMI or waist height ratio is a means of monitoring this. The implication is, that putting weight back on might undo the work you have done to get your blood glucose down.
@Drummer notes, quite sensibly, that if you gain weigh by adding muscle, then visceral fat does not come into the equation.
@AndBreathe suggests some care should be taken when looking at body metrics and relating them to blood glucose control. If you read around the forum you will find a lot of "slimmer" members with blood glucose levels above the diagnosis limit and it is likely that out in the world there are plenty of overweight people whose blood glucose levels are of no concern. There are more reasons for diabetes than being markedly overweight, although that is a good pointer to a potential diabetes diagnosis.
So, are you concerned that you are now below what you might consider to be an optimum weight? Do you have your HbA1c history? From that you can begin to work out the balance that might be optimal for you and then formulate a plan of how to get there.
For me diabetes is a very fuzzy thing. In the middle are some general principles which can be used by many to get control of errant blood glucose levels. Things get a bit more tricky when you move away from the middle and tuning things needs a bit more care in thinking things through.