There are multiple ways to create Marketing Fatigue rules in adobe campaign. One of them in pressure typology.
You can create pressure typology where you can mention the channel and period and number of communication you want to send in that period. Once you create typology rule you need to add the same in typology.
With my personal experience, I want to suggest a few things as I faced them. The issue that I have faced that although have added typology rule in typology and then in delivery template still the rule is not getting applied.
For this, the scheduling must be configured in the channel delivery template as below.