Eternals, the movie that doesn't end

[Psyren]

Dr. Strange isn’t even the only sorcerer it town, either. If he was too busy, there are multiple sanctums around the globe, and more sorcerers than just him and Wong, as we saw in Endgame.

Are there? Yes there were plenty during Endgame, but Morbo seems like he was setting out to drastically reduce that number.

Also, it's unlikely there were any Sanctums set up where

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Tiamut was emerging. They may not even have noticed what was occurring in time.

That said I’m going to add to the list in a different direction: Ego. Being a Celestial, how did either he not notice the Eternals, or (if he’s a different faction of Celestial) how did they not notice him?

Why would they have noticed him? He's not tied to Arishem or Tiamut. And even if they did, he's not a Deviant.