A member is promoted if they are noticed by staff to be both frequent and accurate editors. There's nothing really scientific about it. If you think you should be promoted but haven't, but best thing to do is take a look at your recent past submissions and see if staff has been fixing any of your submissions, and learn from that.
For staff, we look for people who are good at fixing other people's submissions because that is the main difference between staff and trusted.
There is also a rarely-used demotion for members who submit poor albums and show no improvement.
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