I would see the approach proposed by
@River's Edge as just the start of growing a new bonsai. The trunk and new branches would all grow and develop over the next 5-10 years and probably be above - where your tree is now.
Frank's proposal and reasoning are valid but, as he says, others will see other options. Please see below.
The new photos give much better look at the trunk and branches - where they start and which directions they grow in which is all valuable info when making design decisions. I can also see there's a lower branch that was hidden behind the trunk in the first image.
Unfortunately I'm not so good at making a 3D vision in my head from a series of 2D images. I can provide some possible options but you will still need to make sure what I imagine is really there.
ALWAYS take online advice with plenty of salt and check carefully before committing to any course of action. What someone sees in a phot may not necessarily be there in real life.
Another couple of possible design options for your tree.
Because I can't make out where some of the branches end up I can't fully commit to either.
Both are probably lesser quality that could be developed with Franks harder chop but these will give you something like a bonsai in less time - say 2-4 years. both appear to make better use of the existing trunk bends and direction.
Option 2:
View attachment 547438
Cut at red lines. Lower left branch to be removed entirely. Most of the others cut back to encourage more shoots to emerge to create better branching. Remaining branches bent in teh direction of yellow arrows to spread the canopy.
Option 3 is from the other side.
View attachment 547439
Again, remove branches marked red entirely. Cut branches marked blue short to encourage more shoots and branch ramification. Bend remaining branches in direction of arrows.
One of the reasons for 2 opposite options is that I can't fully make out where the upper branches that will be the new trunk lines go. The new apex needs to be slightly forward of the trunk base. Not sure if the ones I've chosen are coming forward enough or too much - need on ground proofing to decide.
2nd option tries to use that lowest branch but it needs to grow toward the side rather than directly to the front. Need to check whether that can be physically achieved or just remove it and go for a larger tree.
Sorry for giving you so many different options to think about. In the end only one will become the tree. If all seem to be good then it does not matter which you choose.