Just diagnosed as pre-diabetic, what should I do?

Hi my name is Stacey I'm almost 60 was diagnosed as pre diabetic with a blood glucose level of 111 my a1c was in normal range  does this mean I'm diabetic.  Don't know what to do now I have hashimotos disease had mild covid case in late dec never had a high blood glucose except 27 years ago when I was preg  what's your advice as to how I should watch my sugar in take fr said he wants to retest in 3 months