The Associated Press yesterday (December 19th) rounded up things from 2018 that it's over and wants to stay out of 2019. They were:
The floss dance
Gender reveal parties
Bell sleeves -- often big bell sleeves -- on women's tops and dresses
Backyard chickens
Keto diet desserts
Subscription boxes
Vampire facials
Using "beyond" as a modifier -- "beyond grateful," "beyond excited," "beyond exhausted," etc.