Assalam Alaykum Ramadhan Kareem,
As a diabetic you want to partake in fasting which is only natural but remember if it going to have a detrimental effect on your health then it is discouraged in Islam.
However if you want to fast and think you can stick it out then Inshallah here are a few tips,
Eat slow releasing carbs and avoid fatty and fried foods, test your sugars regularly and drink plenty of fluids preferably water. You will find it difficult as you are going without food or drink for a long time. Try too conserve you energy if you can especially when it's hot.
Hope that helps.
Peace.