If the IELTS examiner asks you to stop your speech, you can conclude it by using the following ways:
So, that is it.
So, basically, that is it.
That is all I have to say.
That is everything I need to say.
The IELTS examiner will not stop you unless they think you have not finished your answer. Remember that every mistake that you make will have an impact on your overall IELTS score. Thus, you should make sure your answer is clear.