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This post includes a crappy diagram of how I did it.Cough my method cough
Pretty much just choose left or right side and dig down until around 300 depth, then move towards the opposite spawn a bit then dig back up. Continue this for as much as you can. Assuming there’s other people on, you’ll average around 200-400 areas per world, and 1-5 teleporters (although I have gotten 0 teleporters, and also gotten all 7.) If it’s your own world, you can snag 500-700 areas, depending how densely you mine. If you mine on a few worlds each day, you can easily average well over 1000 areas daily, and 10+ teleporters. I found this to be the fastest method, there are a few others I’ve seen that are pretty good. This is what I used. Happy exploring!