One thing about cutting back that hasn't been discussed yet.
A junipers strength is in its foliage. You don't have a lot of foliage and removing the growing tips
removes the ability of the tree to photosynthesize very well. The tips are where the most of the
auxin is produced. Think of the foliage on your juniper as solar panels, to keep the heart charged.
Moving into Winter and the amount of foliage you have, means you should not be removing it.
Especially, especially if this is your 1st juniper and or your 1st wiring job.
Beginning next year, if the soil is draining fast, it will not need repotting generally.
If the soil is not percolating well (water ponds before absorption), you'll need to keep all the foliage
you now have, to help with recovery, post repotting.
Moving forwards in a 3 year plan, and this is a rough guesstimate, as we don't know your care habits,
I would plan to shorten your branches in stages, like 30 or 40% 1st cut and so on.
As you cut back, back budding will occur, and you can build lateral growth as the branch thickens
and gets stronger. As you thin places you have top only growth on the interior of a branch, lower bud(s)
will form lower on the shoot if the juniper is strong, or the shoot will divert more lateral energy.
Again, at least a 3 year plan.
If you were to remove your wire this year. Do not attempt to rewire the branches this year. Let them recover.
Be delicate and cut the wire getting all of it. The black aluminum wire you used is way undersized for the
safety of bending and holding the branch. Undersized wire causes us to overwork the branch to achieve
the desired effect. The lighter color of wire above there on the trunk may be at the upper end of the right size
for the branches. Get where I'm going with this? Bigger wire is harder to work with,
but easier on the branch when you bend it. So a balance of what size you can affectively work with.
That black wire is good for tertiary branching, or smaller secondary, like the last 25% of your branch size/flex.
I think it would be great to go ahead and rewire the trunk only for now, but weigh your decision to do so
based on others input as well. Our 1st wiring jobs tend be harsh on the branches
ask anybody how we know lol.