anarchy

With a belt

What class you running, what difficulty

melee
classic
I have Terrablade and full Turtle Armor

Doing it a hundred times until you memorize the attacks
Or
Build a minecart track that loops in a circle, stay on it, go full speed, ml can rarely hit you since he's mainly in the center
Look up moon lord circle arena if you want more info, it's cheesy though

Ngl I recommend getting beetle armor

Terrablade is ok also I recommend making a bridge of asphalt across the world so you can run away from the moon lord while hitting him