Why don't you say it?

Why don't you give it a try ?

Why don't you try a new hobby?

Why don't you try a different tack?

Why don't you tell her directly?

Why don't you come to the movies with me?

Why don't you try the new restaurant in town?

Why don't you give it a shot and see how it goes?

Why don't you have a go at cooking a new recipe?

How can you be so passive? Why don't you retaliate?