A book that made you think “this book is so awesome that would be a shame if I spent my life without reading it”

Last year I read “flowers to Algernon” and it was amazing. I’m looking for something new to read that will give me the same feeling of “wow, I’m SO glad that I read this book”. It was a sad book but so beautiful and significant for me. It gave me a different perspective on so many things. I was happy because it was on this Reddit community that I got this suggestion! I appreciate any suggestions! Thank you!

by No_No_ahMY