The flat part of the learning curve is where most people quit and where most skill is quietly being stored.

Improvement is not evenly distributed across the time you put in. Long stretches feel like nothing is happening, and that flatness is not stalling; it is the part where the pieces are being filed somewhere you cannot check. People leave during those stretches because the feedback stops, not because the progress does.

When you hit a plateau, change what you measure rather than whether you continue. Count sessions, count reps, count pages, anything that rewards the attempt instead of the result. Then look again in six weeks, when the step up has arrived and made the flat part obvious in hindsight.