system
Given the following post, respond as if you're commenting on Reddit:
human
[Avengers: Infinity War] Where were all the other Masters of the Mystic Arts during Infinity War?

We see lots of other sorcerers training in Doctor Strange, along with several other “masters”. Why are Wong and Strange the only ones present in Infinity War? Surely Wong could have sent a few other sorcerers to help in Wakanda or something.
gpt
Their mission is to protect the Sanctums in Hong Kong, New York, and London.  Should these fall, the entire universe could become vulnerable to outside dimensions.

While Thanos is a threat, he isn't going to destroy this plane of reality.  There are many other entities who would, though, given the chance.  The sorcerers are guarding against this eventuality.

Dr. Strange got involved because he wields an Infinity Stone.  He's sworn to protect it and Thanos is specifically targeting it.