Gently fold the diced strawberries into the batter. Doing this carefully ensures that they are distributed evenly throughout without breaking them down too much or causing them to sink to the bottom during baking.
Avoid over mixing the batter because it can produce a dense, tough texture. When you're combining the ingredients, mix until they are just incorporated.
Ensure the cake has cooled completely before slicing. Cooling allows the strawberry cake to firm up so it slices easily without crumbling.