Sounds like you used way too much xylene. It has to dry out before you can do anything with it. It also removed the natural oils and any waxes from the leather. So you will have to try to carefully replace them. Look up conditioning leather. If you add too much oil, it will be soggy and a mess. Waxes pretty much stay on the surface and you buff off the excess. You can't buff off excess oil. My guess is that maybe after it dries out, you should apply a neutral shoe polish (wax), warm it up some, let it soak in for several hours, then buff it. After that, you could use a coloured shoe polish that might help restore the original colour, or close to it. As I say, it's my GUESS!