Don't take this the wrong way, but please remove that wire.
You should try to make your wiring more pleasing to the eye while it is on your tree and I can't tell for sure from the pic, but I am not sure if that is a good type of wire for bonsai... Find some good bonsai wire, use the correct gauges for the branches you are wiring, and only use the guide wire technique to assist you when shaping a branch. The majority of your wiring should be done along the length of the branch so you can bend and twist it as needed, not just pull it down.
I am not bashing you in any way, Lord knows I have done some ugly wire jobs in my day, just one bit of friendly advice. That tree has some real potential and it is clear you have cared for it well if it is thriving like this after a couple years of working on it. I only see a few branches that need to be allowed to grow out there, you can work on your styling on most of the tree I'd say, but it is hard tot ell from the pic.
Good luck!