The Boon of Luck can be a great choice to help you out in those situations where the dice don't want to help. With this boon, you get a d10 to add to one d20 roll of your choosing per short rest ...

If you're looking to create a fun, whimsical barbarian, look no further than the path of the belly brewer subclass, which comes from the Obojima campaign setting supplement for 5e.