I get new authors to try from here more than through most other sources. I found a few through the "literature map" project, typing in a favorite and browsing some of the claimed-to-be-similar authors.
My most reliable sources are the published winners and nominees for industry awards (Nebula, Hugo, Stoker, Edgar, etcetera). I like a high percentage of those authors I try. You'll have an overflowing list just by looking over a few years worth of those.
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