Channel Strategy & Niche
Channel Plateau
Also called: plateau, growth plateau, stalled growth
A plateau is a flat line that lasts months rather than a couple of uploads, long enough to stop looking like ordinary variance. The instinct is to assume the algorithm has turned against the channel. The Audience tab in YouTube Studio often tells a different story: it shows what else your viewers are watching, and a new channel serving the same demand points to a shift in supply and demand instead of a punishment.
The other usual causes are a topic that has stopped growing and a format repeated past the point the existing audience wants it. All three point back at what you are making rather than at the algorithm.