Which of the following factors wouldn't change an account's optimization score?

changes in auction dynamics

Changes in tracked conversions

Renaming campaigns

Shifts in spend mix

Renaming Campaigns

Explanation:

Based on the information provided within the question it can be said that the factor that wouldn't change this would be Renaming Campaigns. This is because an account's optimization score is an estimate of how well the account/campaign will perform in the near future. Changing the name will not change this score since the campaign is still following the same strategy and therefore the estimates will be the same.