is there anything more difficult?

I picked it up because I was interested in Silksong, but I fell in love with Hollow Knight. I'm currently trying to platinum it, and from what I know, you have to complete the game at 112%, which translates to "do everything." I also know there are some very difficult things to do, so I wanted to know if there were any more difficult things to do after the Path of Pain and all three Colosseum challenges, which I just finished.