One thing that works for me is putting a layer of corrigated cardboard (make sure it's recyleable) down on top of the soil before heaping compost onto it. This gives the compost layer lots of time to develop into a healthy soil with the first crops you put there, and crucially for worms to get going eating the compost, eating the cardboard and starting to churn up the soil. The cardboard keeps the hard layer damp for long periods softening the upper part of it.