You'll love Correction if you have a taste for experimental literature. I've have all of Bernhard's novels. They are (mostly) uninterrupted walls of text. They can also be quite depressing. You'll likely either love them or hate them. Correction is probably the most exemplary instance of his style and experimentation, and maybe his best novel, but Concrete and Extinction fall into this category as well. Wittgenstein's Nephew, Frost, and Woodcutters are more approachable if you want to ease into it. Starting with Correction might be a bit off-putting and intense depending on how often you read more experimental/stylistic literature.
He also wrote poetry.