Retailers Guide To Win Holiday Sales in 2020: Sajjad Ahmad. Adobe Analytics predicts US online holiday sales will increase by 33% from 2019. Make sure your physical store is safe for in-store doorbusters. Host a holiday-themed contest to attract holiday shoppers. Offer exclusive discount offers for first-time buyers. Host contests and give away free stuff to attract customers to your store. High-five for your business. High five! High five with free gift wrapping and shipping and shipping!