Hello and welcome to healthcare magic!!!
your sugar levels seem to be coming down, there is no need to increase the dosage as such now. try and follow the exercise routine you are following and with proper diet control you should be able to get it under control very soon.
Do get an eye examination done now as you have been diagnosed with prediabetes just to make sure there are no retinopathy
Keep a regular check of your sugar levels you can keep a glucometer at home also so that it is more convenient.