By the end of speaking part 2, many IELTS candidates are exhausted and just want the exam to end. Consequently, they don't do as well as they could in part 3.
Ever since I noticed this problem as an examiner, I've told my students to make sure that they master the 3-step (or sometimes 4-step) method that I showed you last Friday.
Practise answering as many questions as you can using the "answer, explain, example (alternative)" method. If you can get into the habit of following these steps, you'll finish the speaking test strongly and make a good final impression on the examiner.