Fix your daily 'win of the day' system
Seriously. It's so outdated, you know it is when a MOBA as 'young' as Heroes of the Storm is able to make it more variable and interesting. Take some lessons, Riot.
http://www.nomarket.org/wp-content/uploads/2015/04/My-first-set-of-Daily-Quests-HOTS-beta.jpg