If a branch is needed at a spot but is too thin, it can be thickened by letting it grow out, without pruning back. This technique is called an ''escape branch'', and can be used to thicken a branch, or thicken a trunk. You can let a branch grow several feet, while keeping the rest pruned short, to get the desired thickening.
I did look again at the photo. I would consider removing the two bottom branches, and choosing first branch from one of the thicker branches higher up in the tree. The bottom branches do both seem to come from the same point on the inside of a curve, which is not ideal. Consider it. You don't absolutely have to do it, the curve is not that strong a curve, you can get away with keeping them. Or just get rid of one of the two.