Why an early win can hurt your protagonist
An early win on the thing that measures the war reads to your protagonist as proof their false belief about themselves was right.
The opposition has to reward the specific false belief your protagonist carries and punish the truth that would free them, or it is generic pressure.
Build the conflict in your world as if your protagonist didn't exist. Then check it as if it existed only for them.
That doesn't mean the pressure only hits your protagonist. Plenty of powerful institutions press on plenty of people. What matters is where the pressure points.
Your protagonist carries a false belief about themselves that runs their life. That's what StoryDNA calls The Lie. A world built for your protagonist rewards that belief and punishes the truth that would free them.
In Whiplash, Terence Fletcher's conservatory is built so that "you're worth exactly what you can perform" isn't paranoia. It's an accurate read of the room, which is why Andrew's belief hardens instead of breaking.
In Little Miss Sunshine, the pageant world makes "you're lovable if you win" the actual scoring system.
Two people can walk through the same situation and only one gets wrecked. A situation is only dangerous where it agrees with something you already suspect about yourself.
Now picture a protagonist with a different Lie. If your opposition hits them just as hard and in exactly the same way, the pressure is generic. That's why a fully built world can still feel impersonal.
An early win on the thing that measures the war reads to your protagonist as proof their false belief about themselves was right.
If you can move your two sides somewhere else entirely and get roughly the same story, your setting is scenery rather than the conflict in physical form.