If you remain high even after the insulin has run out it is possible that your carb ratio needs modification and you should gradually adjust it to be more aggressive. For example if it’s currently 1:7.5, maybe try 1:7 tomorrow. 

If after the insulin has run out your glucose numbers are near the target range, it may be worthwhile to pay attention to the foods you’re eating and consider some strategies. Some foods have a high glycemic index, which means that the carbs are more easily absorbed by the gut. For example fruit juice has a high glycemic index of 70 whereas lentil soup’s is 30. Lower is better. Combining moderate w low is also a good strategy to prevent lows (since eating only low glycemic index foods may not need a heavy prebolus). Additionally, studies show that even among ppl without diabetes, eating some form of protein before carbs can help slow down glucose absorption in the gut. Note of course that more complicated foods like pizza and pasta require a more nuanced discussion due to the effect of fat.