Welcome Aboard BonsaiNut! …and you are bringing a fun to work on tree too! Well Done!
Anyways you came to the right place, there are many juniper folks in the forum.
Concur with
@ShimpakuBonsai … the tree likely might to be pushed back.… a good deal and reduced on top too to get you started.
Here’s a couple ideas.
a. Go for the easy push backs now. (If in doubt, don’t cut!) Leave all far interior foliage, buds etc. Keep things balanced. Do not clean the crotches. Hope for the future.
b. Also likely the top might be reduced as there are a couple thicker branches in the top that look not so good… in fact the top 8-12” (don’t see any thing to scale with) could be cut back to gain some taper, wiring up one of the plentiful branches there. I see a likely one up in the posted images.
c. Next wire the tree and spread out the branches so each gets its own space, move these down (up at the tips) to get maximum bud back.
d. You didn’t say when the last time the tree was repotted. imho opinion to do the work needed the tree should be repotted in Spring to a larger pot (no root cut back unless there are diseased roots) to help push the roots and spur the growth needed. Not uber large pot though…. I’m sure others here will help with this part. Maybe start 1” around.
e. Feed appropriately and wait until next fall.
f. In the interim. Study up on juniper horticulture and styling as much as possible. Also see if there is a nearby bonsai club. If so, join it. It will be another good source of help.
Don’t see your USDA zone and more specific approximate location on your Icon. Its in the thread instead. Please click on your icon atop the page, then on account details, scroll down and enter these data.
Welcome aboard once again!
cheers
DSD sends