If you aren't achieving the desired HbA1c and you are not on insulin, it only leaves the food choices you are making...
if you limit the carbs, your numbers should come down and stabilize.....although medication (oral) may still be needed to deal with your basal needs.....
as mentioned, before eating and 1.5 to 2 hours after eating should give you a good idea as to whether certain foods are good or bad for you.....and of course, a reading before bed and upon waking will also provide useful information.....
best of luck and well done for the effort....