Not sure if anything is actually needed. It just looks unstable. Power is already run to the shed, so it might be difficult to move and do a full concrete pour. I was thinking of lifting with a car jack and finding a better combination of pavers to remove the wood wedges, but I'm open to any ideas. And it is on a slope, the other end is on pavers on the ground. This stack of pavers was the previous owners attempt at levelling I guess.
Oh man, I guess I did just post and run haha. Life got in the way and I never ended up doing a proper fix. I just jacked it up a bit, and adjusted the pavers enough so that it's not resting on the wedges. Eventually I want to move it and pour some concrete posts like someone else mentioned. Hopefully I have time this fall to do this, and my "temporary" fix doesn't become permanent. The ambitious side of me wants to tear down the shed and rebuild, since it wasn't built that well, but that's probably never going to happen.