Complete mastery(stamina mainly) of their awakening and one more power up should push them to that level imo. Master the DF power offpanel and get another power up vs Admirals EoS is my guess
As you read further you come to realize that yonko level isn't a thing use for strength but a title for any great pirates who were infamous for not only being powerful but they also have fleets and territories in their name to have the public recognize them.
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