I'd go for option 2 and sell them individually. I also had to do the same when i quit mining a year ago so i may know how difficult it is. It depends on where you live but i think your best chance would be to sell GPUs and motherboards to gamers and sell the PSUs to hobbyists and solar enthusiasts. At least thats how i got rid of mine.

But also, i kept one rig for myself, my 1080ti rig. It's turned off atm but i'm hoping the same as your option #3.