A dystopia stands or falls on whether its world makes sense. Readers do not need a lecture, but they need to feel that someone worked out how this place functions: who gives orders, who benefits, how food and information move, and why most people go along.
We begin with cause. What event or decision tipped the world, and how long ago? A regime that rose last year acts differently from one that has lasted three generations. The past explains the present, and the present shapes what rebellion looks like.
Then we build the texture of daily life. What do people eat, wear and say? What does a child learn in school? What is a normal day for a clerk, and what is a dangerous one? Details like these make a society feel inhabited, and they supply scenes that no outline would predict.
Control also needs a weak spot. Every system has a gap, and the plot usually lives there. Finally, we set the rules and obey them. A rebellion that works only because the author needs it to is the quickest way to lose a reader. Hope has to be earned the same way the horror was.