Good advice isn't just “easier” or “harder”. You need to know which skills are already there, what level gap is reasonable, and whether the style of the next work consolidates or destabilises.
Levels drawn from pedagogical sources are brought onto a common 0-to-100 scale, with an associated confidence.
Observations of technique, reading, rhythm, style and interpretation make visible what the work really develops.
Each suggestion is ranked by difficulty gap, skill overlap, risk and musical context.
A teacher remains essential to account for the hand, tempo, reading, motivation and musical goal. What do we play next? gives a verifiable starting point to prepare that discussion.