It's easy to write stuff that's not terribly derivative.
First, scrap the pointless humanoid races, and make your own set. Elves are hippy angel-folk. Dwarves are short scottsmen. You don't need them.
I say, start by making humans seem alien instead of turning human archetypes into inhuman folk. Humans are taller than most races, and HUMANS are inherently magical (Why do you think you need a HUMAN sacrifice as opposed to a dwarf sacrifice or a goat sacrifice and HUMAN blood?), or at least more-so than most species. They're omnivorous. They have the weird hair-not hair thing. Humans are always the plucky heroes, always finding magic swords or becoming wizards.
Let's extrapolate this further. See the human race from the outside. Take everything you've learned about them, and exaggerate it. Get the seventh-hand account tall tale.
Humans are huge. Seven or nine feet tall at least. Humans will eat anything: plant, animal, dead, living, sentient or non, even their own species. They'll try eating rocks, fermented sour milk, droppings, anything. Humans can shoot lightning and move objects with their minds. Every human has a magic power and a fairy relative. Humans will have sex with and concieve children with any species.
Then, make up your races.
...anyone wanna try?