Engage with the community. There are many fans of Umineko English Visual Novel out there. By discussing the game with them, you can gain new insights. They might point out things you missed or have different interpretations that can expand your understanding of the game. Also, re - reading can be a great way to fully enjoy it. You'll notice things on the second or third read that you didn't catch the first time, which can make the experience even more fulfilling.
Immerse yourself in the characters. Try to understand their perspectives and motives. This will make the story more engaging and also help you in predicting the twists and turns. Another important aspect is to take your time while reading. Don't rush through it. Let the atmosphere and the story build up gradually. This visual novel is not just about the end result but also about the journey through the story.
First, pay close attention to the details. There are a lot of little clues and hints throughout the story that are important for understanding the overall mystery.