In the end Kratos and Atreus (Loki) reach Jotünheim and find out that Faye was the last giant and foresaw all of this (which I dont get how she did but okay)

First question: What was the last wall painting that was briefly uncovered by wind and only Kratos saw it. Was it Atreus killing Kratos?

Furthermore we learn that Atreus (or Loki as his mother wanted to name him) is hald giant obviously. Baldur at the start said he knew what they where and they know what the want

Its obvious that he meant they were gaints but... what did Baldur want? Or Odin for that matter?

Overall Odin wants to not die in Ragnarok and he cant reach Jotünheim so I assume they wanted a way to Jotünheim and thought Kratos already knew it (and in the end he did) but why did Odin want a way to Jotünheim?

All giants are dead so whats the point anyway?