I suggest you do as I did three times before, and am about to do again, in the next few months, when I return home.
First, sort out EVERYTHING in neat piles according to brand. Nikons in one box, Rolleis in another box, whatevers in yet another. One brand, one box. Do not mix them. Don't leave anything out. The good, the bad, the ugly. In it all goes.
Next, pick out ONE KIT of the very best of what you have in each box. Put that aside. As it's the best, you can always sell it for top dollar in future, if you decide to do this, or you need the money. Don't bother to keep second best, third best or outright crappy stuff, it will take longer to sell anyway, or go for less, with more effort on your part. You will probably want to keep this kit in future anyway. So do it.
Do NOT dispose of anything Nikon, unless you happen have, as I do, three 28mm f/2.8 D lenses, two 35mm f/2 Dlenses and three f/2.8 180mm ED lenses. Don't ask, please. I have absolutely no idea how I acquired so many dupes and trips. Perhaps I put them too close to one another and they quietly multiplied in the night... OK, bad joke. In fact, I bought out the contents of two camera shops in country towns in Victoria (Australia) some years ago. The outdated films alone took me two years to sell off. Still heaps of stuff left. Next time, I will list it and sell it, I promise. Maybe.
Then put away the good kits. Remove the batteries, if long term storage is intended. Pack everything safely. If humidity is a problem in your area, don't put cameras or lenses in their (usually leather or vinyl) cases and leave them there. Those infernal internal spider webs (fungus) will leap to the fray when you turn your back.
Now forget about the boxed and stored gear, and just go and do your thing with the cameras you want to work with for now.
Believe me, you will thank me in future for this advice. I have learned all this at the cost of much sweat (and not a little blood).
