I insulin not working!!

I took 30 units last night up from 26 the night before and my fasting is not moving not even a little. Still 102-105 range. I had 2 tbl spoons of peanut butter for my night time snack. I’m not perfect at following my diet but majority of the time I try my best. What are some things you guys do? What are some of the doses for insulin that work for people?