New Cascade Tree

[Bonsai_J]

Hi, all. I'm new here. I wanted to get a little insight on my new bonsai project. Bought it from a nursery in mid-March. Trimmed some of the excess branches and wired the main branch to sweep downward. After a few weeks of looking at it, made sense to me to go ahead and re-orient it so that the tree would actually grow in the cascade shape...

I started researching how to make a shari and landed on another video the guy had on getting a thicker trunk:

I switched from the shari to this because it seems like the tree needs to be a bit larger than it is now (the pot is only 7" wide). Josh in the video said that for thicker tree growth, you need to have the tree in a larger pot where the roots can grow and not be bound. My question is would it be safe to go ahead and make the switch when I basically just reset the tree a few weeks ago?

 

[Wires_Guy_wires]

It is not entirely safe to do two repots in a single season, no.

For now, I'd let the plant grow until the pot is full of roots. A pot that's too large can also cause the plant to slow down growth, because instead of investing in top growth, it will spend some time investing in root growth only.
So you haven't set your plant back, yet. Give it a year, then repot into something two sizes larger.

 

[Shibui]

No indication of where you are? Repotting and many other bonsai techniques are seasonal and that varies from place to place. It may be safe to repot now or might not be safe depending where you are keeping the tree.

Generally, within a couple of weeks of repotting it is usually safe to pot again as the new roots will not have grown much. After that, changing the pot can damage sensitive new roots which is not desirable.
If it was recently repotted, there should be plenty of room for new roots in the current pot so growth should be pretty good for the coming season. You could pot on next spring if you still think it needs a bigger pot at that stage.

Hard to tell if the tree is indoors or out from the photos supplied. I hope you realise that junipers will not survive long indoors. Even though bonsai are small, the trees are definitely outdoor trees and need sun and fresh air to thrive.