Good you are practicing hanging wire. Practice and study is the only way to get better.
Not to feel too bad, this is a fairly common mistake, esp when laying heavier wire on junipers and bending right at tree junctions, radically forcing larger sub branches out and away from each other. I’ve made this mistake myself, particularly when working in tight spots and bending aggressively without carefully studying the layout.
The easy answer is likely not if the branches are bent back together right off. Even have slipped zip ties over the junction similar to #3 after rejoining split to ensure junction is closed. Works. Needs about a year to seal… or more depending on tree growth.
Junipers are tough and the sub branches may survive if not bent back together , but likely structurally integrity will be compromised for one or both branches. If not dead, when removing the wire the most affected sub branch, even if not dead, may break the .
Good Luck!
Cheers
DSD sends