In the bio that comes with the press release for the new Robert Walser novel, The Tanners, I'm informed that Walser "stopped writing in 1933 when he was hospitalized for mental illness, declaring, 'I am not here to write, but to be mad.'"
Clearly, Walser was a one-thing-at-a-time kind of guy.
But anyway, read Robert Walser, who drew such adherents as Kafka, Hesse, Walter Benjamin, and Sebald. What more needs be said?
Oh, I know: The Tanners comes with a 37-page introduction by Sebald, with photos.