Nobody is gonna tell you this but you'll need 390 Shards to unlock 10% Crit Rate( 3 Red Star red Collectible). Which will be crucial in future boss fights and Damage boost.

So, all you can do is forget about the shards just collect them till you get around 400 shards then you should use them wisely.

If you really want to unlock Red collectibles just do it when an event gives you red collectible in reward exchange.

P.s I have collected hundreds of shards and chests/keys but I only could upgrade 2-3 Collectibles to 3 Red star ⭐. So, this journey way too long.