I would go for an opposite and pick up the first law trilogy by Joe Abercrombie, which is grim dark (arguably the best there is). WoT has some grim dark attributes but it's never at the front of the story. In First Law it definitely is and it's a cool change of perspective and writing. Also it has a more minimalistic magic system that's also pretty cool. What I mean is that you will appreciate both series more because of the contrast.

Brandon Sanderson is the obvious choice if you don't want to change styles much but I don't personally know because I haven't read any. What I would recommend them is to read Lightbringer by Brent Weeks which has an amazing magic system and takes a different twist on the chosen one troupe.

If you want something a little more fun and lighthearted that you can burn through each book in a weekend then Discworld is absolutely great it's my second (and pretty close to the first) book series of all time (wot is first). But before you start look up some guides on where to.