Because of the thin droopy branches, I would cut this back to much thicker stems, removing anything with a stem less than 1/4 inch diameter. You can even cut back all the way, leaving no leaves, as I did recently with few plants.

I like the bonsai look, with no leaves in the lower 2/3 of the plant, emphasizing the trunks, which only get thicker with each pruning. They leaf out again very rapidly, and you can't hurt them. You can root all the cuttings if you like, making lots more new plants.

Just start shaping your plant. Don't worry, you can't make a mistake. Try to give it more light if possible.

Brad

Here is a link that might be useful: Jade Tree Mutilation