The wall on the left is not being utilized. Shelves as mentioned would be a good idea or one of those behind the door hangers. Hang it high, fill with scarves, gloves, perhaps some shoes, smaller items that could be stored and easily accessed.
I use these storage bins, turned on its side and put folded tee shirts in.
That would give you a bit more hanger space.
Also getting those fuzzy hangers are so much thinner and take up less room.
Sometimes the hangers take up more room than the clothing on them.
I would mark the shoe boxes with the color of shoes for easy access.
Try to put on an item of clothing you haven't worn for a long time and decide
if you still like it. One item a day and you will go through your closet.
I am now going through my shoes that I haven't worn for a while.
Yesterday I put on a pair I hadn't worn for a long time. Wore them to pop
to the drug store. Couldn't wait to get home and take them off.
Into the recycle box they go. Now I know why I hadn't worn them !
Q