I’m looking for existential books with little emphasis on plot or rigid meaning

I want to be thrown into my brain to swim around and grasp at whatever meaning I come across. Something contemplative but not classically philosophical.

I know it’s a picky one post but I recently watched Camp Miasma and I’m craving a similar heady, free-form experience. I asked the lady at my favourite bookshop and they recommended The Idiot which I picked up and will start tonight. Thanks for any recommendations!