If you go to Settings > Admin > Discounts & Promos > Promo Carousel, you can create a promo carousel prompting your customers who use the customer app or web app to create a repeat pickup order with you.

When you go to add a promo carousel slide, just make sure to select 'Create Repeat Pickup Order' as the 'Button Action'. Have a look at the image below for reference.

Once you do this, customers will see this promo carousel slide on the customer app or web app home screen which it will prompt them to create the repeat pickup order.

Have a look below for an example of this.