Two related suggestions:

1. In the store we can now buy colourless evo shards for colourless evo shards of 1 less star (eg: buy 3* shards using 2* shards). Do the same, on a rotating basis, for coloured evo shards. Place a limit of say 5 purchases on it a month if you have to, but this is needed now that you need lots of 3* coloured evo shards for Awakened characters. Re: Rotating basis, I mean like you do with the rune purchases and coloured evo pack purchases. Some weeks it's red/green/blue and some weeks it's yellow/purple.

2. More shard slots. I'm constantly selling off shards as I'm always close to the limit. Even if I sell off 3 slots worth of shards, I'll be back to the limit the next day. It's just annoying. Just boost the limit by 10 shard slots already.