When picking a plot always think 'imagine'.
'What if'? What if you could write the best plot ever?
The needs to write the best plot:
1. NO IDEA IS BAD! If someone tells you it's a bad idea don't listen to them. We live in a world where everything is a story. Nothing is bad.
2. Imagine if you were reading this book. What do you want to read about? What would your ideal situation be ad what would you want to do about it?
3. Anything is possible. Unlike reality anything can happen. There are no limits! The only limit is yourself.
I hope these helped you but if it didn't then please click this link to give ideas.