In a medium bowl, combine the sliced strawberries and sugar. Cover and let them macerate for about 30 minutes to release their juices.
Slice the angel food cake lengthwise into three equal rounds, then cut into 1-inch cubes.
Once the pudding is fully chilled, fold in 1 cup of whipped cream until fully combined.
Assemble the trifle: Layer the cake cubes at the bottom of a trifle dish, followed by spoonfuls of macerated strawberries and their juices. Add a layer of pudding, then spread a layer of whipped cream on top. Repeat another layer of the cake, strawberries (save a few for the topping), pudding, and whipped cream.
Chill until ready to serve, at least 1 hour.
Notes
Storage: Cover the trifle dish tightly with plastic wrap and it'll last for up to three days in the fridge.