Sorry to hear you are having such a rough ride
@Abs23 with the pandemic making your introduction to T1 much more chaotic and disorganised than it would have been.
It sounds as if you have been given fairly conservative fixed doses to begin with, possibly because your HCPs are not sure how much of your own insulin you may still be producing.
Have you been advised how much carbohydrate you should be aiming for to ‘match‘ your meal doses? When using fixed doses this is an important part of the puzzle, and even though your doses are the same each meal you may find you need to aim for a different carb total for different meals because of changes to insulin sensitivity during the day.
If the meal and the dose are balanced then your blood glucose will be back to more or less where it was before the meal by approx 4-5 hours afterwards.
So the first thing to do is to start working out how many carbs you are eating, and to see whether you need fewer carbs to match your fixed doses. If you eat a few fewer carbs than that then your high BG will gradually reduce over a day or two.
Alternatively, as
@rebrascora suggests you could ask to be given guidance on adding extra insulin to correct your high BG more rapidly. But insulin is a powerful and potentially dangerous medication, so caution is advised in the early days
🙂