How to answer this topic better
This topic sounds more advanced when you include both the problem and the outcome.
State the old habit, why it was not good, what changed, and how life improved.
You can record an answer, review the transcript, compare it with a stronger sample answer, and retry the same prompt without losing the main idea.
A habit I changed was staying up too late at night. In the past, I often slept very late because I spent too much time on my phone or watching random videos. After some time, I noticed that I was always tired in the morning and it affected both my mood and my studies. So I decided to change this habit by setting a fixed time to stop using my phone. It was difficult at first, but after a few weeks I started sleeping better and feeling more focused. This change improved my daily routine a lot.
This is around Band 6 because the problem and result are both clear, but the language could be more varied and polished.