Looking to Join a Raiding Guild(Alliance/DPS)
As Marp stated availability is a very big factor for any raider and raiding guild. If you can't make the times a guild has designated for raiding then its unlikely they'll take you, or that will enjoy your time there (since you won't be raiding).
Another factor that is just as important is availability (though these two can conflict with each other) is what your goals and expectations are from joining a guild. Neither side will enjoy each other if your goals and expectations conflict.
There is more to choosing a guild than just this, but that would make a lengthy (and most likely pointless) post. Stick to those two factors as they'll help reduce the number of possibilities, and help you to determine how you should present yourself when you're putting in an app.
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