Books like Flowers for Algernon

I just put down this book and I absolutely loved it. This is the first book which has changed something in me. I've never really had people who are mentally handicapped in my life. Reading this book helped me have so much compassion towards a group of people I didn't know anything about.

The character journey in this connected with me so much. I really want to read more books which broaden the world outside of my experience alone. Please recommend book which does that like Flowers for Algernon.

Thank you in advance!