Has your model ever failed on out of time validation because of seasonality? If yes, then you need to know that one of the reason this happens is seasonality in performance or seasonality in cohort. This article will tell how to identify them and then take you through the industry standard techniques to take into account seasonality while building model. Most industries have seasonal business trend....
https://neveropen.tech/festive-season-special-building-models-on-seasonal-data/?fsp_sid=105445