A great book that will help with posture, including fixing pelvic tilt, is 8 Steps to a Pain-Free Back by Esther Gokhale [1].

The author traveled around the world and looked through history to find out if we always had such terrible posture. It turns out that industrialized societies put a large emphasis on good posture up until the early 20th century. Even today, great posture can be found in less-industrialized cultures.

The Gokhale method has been a game-changer for many, even though it flies in the face of a lot of modern theories about designing furniture and "good" posture. I've personally met people with arthritis and lower back problems who were able to reduce pain and prevent further damage with this book.

[1] https://www.amazon.com/Steps-Pain-Free-Back-Solutions-Should...