The term Dungeon Master implies you are the definitive arbiter of the game. In fact, it’s often positioned that way.
But here’s a tip: D&D is about exploring. Information is commonly, deliberately ambiguous. You don’t need a definitive answer every time, just an interesting one.The core issue with Dungeon Master is the "Master" part.
Sure, it sounds VERY cool.
But it implies you need a peak level of rules knowledge, campaign/adventure knowledge, and play experience to DM.
And that's not just wrong, it keeps people who would be good DMs from trying it.

— Six Hit Points (@sixhitpoints) October 20, 2020

Heh. I was just thinking last night about how I don’t like almost all the terms for that game role.That's why I insist my players refer to me as Mister Manager.

— Six Hit Points (@sixhitpoints) October 20, 2020