I need to escape

I'm feeling fairly down with life and the abject purposelessness of everything at the moment and need a good book that will keep me away from my phone and dwelling on my lack of direction and meaning.

I've been reading whatever looks interesting to me but I've not really been captured by a book in a while. I've read The Lord of The Rings and I think that was the last time I felt like I didn't want to leave the world of a book. I'm looking for something like that: a book that I can get lost in.

I'm interested in tackling some Dostoevsky and I have Don Quixote sitting on my shelf, but I'm open to any and all suggestions of what might be a good thing to try.

Thanks in advance.