How Babbel grows

When starting in a revenue role (Babbel, then Yousician), split subscription revenue into four buckets: new subscribers, upgrades between plans, renewals, and win-backs (churned users who return). Track how each bucket evolves over the years in Excel, find the big jumps or drops (e.g. new-subscriber revenue jumping from a given month), then ask what happened and map it to the decision (e.g. launching a lifetime subscription). Link or embed the documentation of each decision in the same spreadsheet and turn it into a short presentation to share. Prefer this over reading every entry of a long experiment log, since many experiments don't matter.