A good structure should help you decide what to analyze next. If it only sounds organized in the first two minutes, it is probably too descriptive and not tied closely enough to the objective.

After each major piece of analysis, reconnect it to the structure: which branch did this address, what did we learn, and which branch is now highest priority?

Practice using your structure page throughout the case rather than abandoning it once the interviewer starts asking questions. If useful, this guide on case interview structure and flow gives more detail.