Next God of War after Ragnarok should let you travel between lands like shown with Tyr.
Let you even return to Greece.
Lands I'd pick are
Egypt (Egyptian Mythology
Greece (Greek Mythology)
Japan (Japanese Mythology)
Mesoamerica (Aztec/Maya Mythology)
Scandinavia (Norse Mythology)
That's a good start, then future installments letting you travel to others like Celtic, Polynesian (Polynesia as a whole), Slavic (Russia), West African, etc.
I would love for Inuit and Australian Aboriginal but the latter especially still follows their beliefs today so out of respect would be better to leave it out as cool and as much as I'd want it.