You should leave your juniper alone now to let it gather energy. Don't mess with it til July. Fertilize and fertilize. Get some organic fert. (Big box stores carry the Espoma line with products like plant tone, holly tone, cottonseed meal, etc. Plant tone or cottonseed meal would be great. (Fert is always a controversial subject and likely to draw comment. However, both of the products will work, are available at local retail, nurseries and box stores and reasonably priced.
One important thing to do, later in season, is to prune the ends of the branches to try to chase foliage closer to trunk. (I would do this gradually and it will take a few seasons. Avoid having the pom pom look