What is the best way to add shelves to my walk in closet?

There are two shelves on either side with hang bars beneath them. It is a rental home but I can repair any holes when I get ready to leave. One side holds my hanging clothes and I have bins and boxes stacked on the other side. It is a hassle to get to my crafting boxes and fabric bins even though they are labeled.
I will have to do the work myself but I have a saw and a drill.

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