Oh, just wait.
You're in for a treat..
It's technically a girl, but not the point.
I recommend you finish the story and do the Dwarf Favours before you go after the Valkyries (yes, there are various).
Go and explore Muspelheim and Niflheim, craft stonger armor and upgrade your weapons to the maximum.
Valkyries are the ultimate challenge.
Next year would be good.
But as soon as possible.
Thor and Odin would die fighting.
Odin, most definitely.
Hephaestus is dead, so no.
Deimos is also dead, so, again, no.
Out of these, Kratos.
Besides Kratos, Atreus.
Besides those two, Mimir.
He isn't really old, he's middle-aged.
But still fit as hell, so "old" Kratos would definitely win.
Probably like a golden city with beautiful trees.
Until Odin shows up, that is.
And Thor, since he appears at the door in Atreus' dream.