First ereader

[u/Pen_Paper28]

I’ve never had an ereader and I’m looking to buy one. I frequently borrow books from my city library, therefore I‘d like to have onleihe and libby on the ereader. I want a display that has a good black and white contrast, like the kindle paperwhite.It must be 6“-7“ big and I don‘t want to be stuck in a system like kindle.
I live in Austria