How do you eat bagels?

I love bagels and don’t have them often but when I do I can never get the bolus / timing right. Today I appropriately bloused and then waited maybe 20 minutes to eat, I could feel my glucose levels starting to drop before I ate but after I was done I got a low glucose alert. I know that bread is a “slow” carb like takes a while to hit your blood sugar so I knew my blood sugar would go up eventually. But I hate this. Does anyone have tips on avoiding this situation? Thank you!