I've adjusted stuff, built shelving, all that stuff...
On my property I own a whole separate building. Two actually, but one was built (block garage with a wood 2nd floor for a wood shop). I've stored some things up there but the garage isn't heated, nor air conditioned. Costly projects for another day.
The other buildings on the property came as part of a deal where old coal mines on the neighboring property were purchased when the owner passed away and his wife offered them to us. I guess he was always going to, but just never got around to it, so she did for a song.
One of the buildings is a large garage I could get 3 cars into if not for my brother's lazy ass wasting some of the space (he "works" out of it from time to time for extra money). It's got enough room inside I could easily build a loft within it and virtually double what space it gives me. It's just a stone block building and isn't in the best shape, but it functions and could function a lot better. It was once the "mule barn" that housed the mules that pulled the mine carts in/out of the mine dug into the hillsides.
There is another building right beside it, much smaller, but it's had the windows and door removed now, and I'm keeping mostly scrap and lumber in it. I think I may convert it to a mini-garage for mini-things though like my garden tractors and the tiller. It could work for that junk. In the interim it works ok for storing scrap and used oil and junk like that.
There was another building too on the property but it's collapsed... It was also on the other side of the creek that they used to pump water from and things. This was a blast to grow up in this area and play, let me tell you.
It's left me with space I can use, but it's all space that's going to take work to maximize it. I'm still cutting down/back... At the same time I find new things I want now and then too, so I'm torn. I can easily see cutting back a lot of Star Wars stuff I have that, honestly, I don't even like now. I really could see unloading my old toys from my childhood too, even for a song, just to have less clutter.