My experience is no one really gets promoted/rewarded for these types of things or at least not beyond an initial one-off pat on the back. All anyone cares about is feature release velocity.

If it's even possible to reduce incidents by 80% then either your org had a very high tolerance for basically daily issues which you've now reduced to weekly, or they were already infrequent enough that 80% less takes you from 4/year to 1/year.. which is imperceptible to management and users.