Repeat before you retreat
A single missed set is usually a bad day, not a real plateau. Keep the same load next time and attack it again, most of the time you get the reps and keep progressing without any change.
One missed session is normal; repeat the weight next time, and if you stall twice, deload about 10 percent and rebuild.
Missing your target reps once is not a failure, it often just means bad sleep, food, or a stressful day. Repeat the same weight next session and try to hit the reps. If you miss the same weight two or three sessions running, that is a genuine stall, so deload by about 10 percent and build back up, which lets you blast through the sticking point with fresh momentum. Also check recovery, since most stalls are under-eating or under-sleeping.
A single missed set is usually a bad day, not a real plateau. Keep the same load next time and attack it again, most of the time you get the reps and keep progressing without any change.
If you fail the same weight for two or three sessions, drop it roughly 10 percent and rebuild over the following weeks. That short step back clears accumulated fatigue and gives you a running start to break the plateau.
Most stalls are not a program flaw but under-eating, low protein, or poor sleep. Before overhauling anything, confirm you are eating enough, hitting 1.6 to 2.2 g protein per kg, and sleeping 7 to 9 hours.
One missed session is normal; repeat the weight next time, and if you stall twice, deload about 10 percent and rebuild.