I've Been Killing Slimes For 300 Years And Maxed Out My Level

After dying of overwork in the real world, Im reincarnated as an immortal witch, and I spend 300 years enjoying a relaxing life. At some point, though, I end up at level 99! All those years spent killing slimes to make the money to pay the bills gave me a ton of experience points. Rumors of the level 99 witch spread, and soon Im up to my ears in curious adventurers, duelist dragons, and ev...