What am I supposed to do with all this champion chards and blue essence?

So, atm I got 34367 blue essence and not sure how many champion chards but I stoped counting after 50 but its probly around 70-80. The problem is that I have all champions so there is nothing I can use the champion chards for. I could disenchat them for blue essence but then what? What would I use the blue essence for? There is nothing I can buy for blue essence in the shop. And it´s really annoying when I get a hextech chest and I only get more champion chards. So riot can you change so that when you already have all champions you don´t get anymore championchards from chests? Or atleast get something we can use the blue essence for.
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