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If you just repotted and pruned, right now you want to give that tree a long rest so that it will recover before you do any more work to it. You will want to wait until that juniper is bursting out in growth all over and looks very shaggy.
The first thing to learn with bonsai is how to keep a tree alive
So while you let this one rest, you need to go buy two or three more so you don't kill your one tree with kindness - by doing too much to it too quickly.