This is my top 10, but it of course suffers from the Bookmeter issue of not handling author names well. You’ll note I read 江戸川乱歩 3 times and 江戸川 乱歩 three times 
According to Natively I’m currently at 75 unique authors - a decent chunk of those though short stories, I bet. 
For straight up literature I like 太宰, but mostly I enjoy pulpy crime novels, hence the above (my 推し), 赤川次郎, and 知念実希人.
I suppose if you want more serious, 横山秀夫 (having a reading club for 半落ち in the new year btw…), 奥田陸 (of the current ユージニア club), and 宮部みゆき (will have a reading club for レベル７ on the Natively forums in ~February) are good authors to look into. If you like crime anyways. It’s my primary genre.