What are the most grindy games ?

Looking for the most grindy games

RPGs I can spend thousands of hours on?

Or sandbox games / action games

Looking for RPGs where it kinda like Runescape think black Grimoire cursebreaker or don't have to rely on other players

Games I have tried

Final fantasy

Path of exile

Warframe

Runescape atlyss, mech warrior 5 Elin erenshore

Pantheon rise of the fallen

Sirulium ultimate

Disgera 5 Moonstone island Kenshi

Sulfur

Remment of the Ashes