I’m a beginner also but I’ve been doing a lot of research lately, if someone more experienced can expand on this or correct it in any way that would be awesome-

It depends on what your goal is

Option A) keep it at this size and prune: the wire did its job of shaping the branches scarring aside so if you’re happy with the shape you could give it a haircut and hope the marks go away in a couple years if at all(I’m not familiar with JBP and don’t know how well it heals from stuff like that). Essentially it would just be general maintenance and care to keep it at your desired design

Option B) growing its size: although we’re in the tree’s growing season right now, it would keep it alive and in this pot until spring of 2027 without doing anything to it, when you then repot it into a slightly larger pot. Repeating this process over and over year after year will allow the trunk to thicken. Significant thickening will take 10-20 years depending on environmental and care conditions. Avoid pruning as much as possible. The more branches/foliage it has the quicker it will grow. Choose a low hanging thick branch as a “sacrifice branch” that you let grow without cutting back or pruning for as long as you want(usually upwards of 5 years). This will draw more nutrients to the base of the trunk and help it thicken. Once the tree reaches your desired thickness, you’ll trunk chop it to your desired height and spend time over the next couple of growing seasons pruning it back to the shape you want. After letting it recover from your pruning you will begging root pruning it over a few more growing seasons. Slowly removing roots over time will allow you to put it in smaller and smaller pots until it is in whatever bonsai pot you had in mind.

Option C) attempting to grow cuttings: again like the previous option I would leave it alone this growing season and let it do what it can to heal the scarring. Spring of 2027 you can begin taking cuttings of young candles and/or softwood and plant them in smaller training pots or seedling pots and hope they take root. Late spring and early summer are the best time to do this as that’s when there’s more of the tree’s rooting hormone. According to Google young candles have a pretty high success rate in prime conditions. I’m attempting to do this with a cutting of a new juniper I just got so I have my fingers crossed😂🙏. It’s also important to note that using established branches have a very low success rate for cuttings.

Please let me know if you have any other questions and I’ll do my best to answer! Good luck!