Keep an early recording or short piece of writing and return to a comparable task later. Use the same prompt or one with similar demands. Comparing a simple introduction with a difficult debate does not provide a clean picture of the change.
Choose a few observable goals: the main point appears early, the listener can identify the final arrangement, and the important date is accurate. "Sound more advanced" is harder to assess and may encourage unnecessary complicated language.
Describe what changed
A useful review might say, "In the first attempt, I mentioned two possible times but did not choose one. In the second, I clearly confirmed Thursday at eleven." This is evidence about communication, not merely a feeling that the recording was better.
Notice remaining difficulties as well: "I still confused the room number once." Choose a targeted next activity, such as listening and read-back practice with numbers. Do not convert one successful attempt into a claim that the difficulty has disappeared in every situation.
Include the conditions of practice if they changed: prepared notes, extra time, or a familiar partner can affect performance. Keep the comparison encouraging by making improvement visible and the next step manageable. The purpose of self-review is to guide future practice, rather than to produce a single label that summarizes your entire English ability from two small samples.