God of War Ragnarok: Things to do after finishing the game
This is an amazing game and it turns out there are a lot of things to do after finishing the main story to keep yourself busy. I will list out all the things I know here and also provide a link to the locations/guide.
Spoiler Warning Ahead !!!
1. Muspelheim Crucible
I mentioned this first because I highly recommend upgrading your characters to max before doing any of further mentioned tasks — weapons, weapon attachments, armours, relics, runic attacks, Freya’s sword, runic summon etc. To upgrade some armours, weapons to max you would need items you would get only by finishing crucible challenges. So its definitely worth your time.
I would suggest Kratos should be atleast level 8 (level 7 for lower difficulty) in order to defeat some of the enemies in the further tasks.