Not questioning Austen as number 1.
For the rest, I'd put forward Graham Greene, and @mike rightly mentions PG Wodehouse. I'd also add #SamuelRogers, for his little Table-talk volume alone (I don't really know his other works).
My main nomination however is Samuel #Pepys, providing we make allowances for the fact that writing a diary entry late at night when drunk will lead to occasional stylistic lapses. His lapses are beautiful. Sam does post on Mastodon, @samuelpepys.