I think the word you are looking for is “sextuple”.

Interesting though, because many would consider a quadruple as consisting of the following:
League.
Cup.
Champions League.
SuperCup.
But some might say that the Super League counts towards a quadruple. For me, it needs to be the CL, not the SL.
Sad to say I have never even won a treble let alone a quadruple.
Interested to hear what others think.