You have those rafter racks that hang from the ceiling? They take zero ground space and offer a lot of storage. I highly recommend them!
I can fill it up quick. My wife has been a great help making sure to go through every 6 months with me and clear the floor completely. I do throw things out on a regular basis. Sometimes it is painful, but my rule is that if I don't use it and it is cheap to buy new, I give it away and get it again if the need may arise. It feels better when you are done cleaning.
My biggest clean out effort was the KTM recently and I also sold my track fixie. The KTM was also tough to give up but I just didn't have time to ride it the way I had planned. Was able to move the bicycles back in the garage from the shed. (Total of 7 bicycles for all of us!

) Only the 993 is in the garage.
G