I have no advice on cutting back on your addiction but I have space-saving advice.
Buy a box of Zip-lock bags, found in most grocers & Supermarkets.
Systematically go through each box and clip out the pieces and store them in Zip-lock bags.
Throw in instructions or if unneeded, at least a label of what they are for ease of identification.
Dispose of boxes and empty sprue frames.
This would likely condense EVERYTHING
in that picture to one single shelf.
Now that you have more room to spare, you can buy more stuff.