Be sure to not overbake the cupcakes.
The cupcakes can be prepped the day ahead, as well as the macerated berries, but not the whipped cream. Prepare the whipped cream no later than 2 hours before serving cupcakes.
Be sure the beaters, bowl, and cream are all very cold or the cream will not whip. If you prefer a sweeter whipped cream, add more sugar, though the berries should be sweet on their own.
The instructions for the cupcakes is according to Betty Crocker(R) cake mix. Follow instructions on box if using a different brand.