In the case that your monologue is too short and you need to complete it in order to speak for 2-3 minutes, here are some strategies that you can use.

You can use an introduction like this (or shorter):
First of all, let me introduce myself. My name is Mike, I live in Icod, I’ve been preparing this test for a long time and I’ve been studying English since I was at school. However, right now I’m terribly nervous, so, therefore, if I make any mistakes, sorry, I apologise in advance. Ok, wish me luck. Here we go.

Then you can use strategies to expand your ideas like these:
So, the question is: “Are you a spender or a saver?” ... repeat the question
Well, it’s not easy for me to answer this question, let me think…gain some time
Actually, I had never thought of this before…
By the way, the other day ... use a personal anecdote
Personally, I disagree with the idea that ... use a personal opinion

You can use a conclusion like this:
So, to sum up, as I said before, in conclusion, I am a spender. As I mentioned before, I adore shopping.

And finally an ending like this:
Well, that’s it. I hope you have liked it, and I hope I have passed the test!
Thank you for your attention!

IMPORTANT: use these strategies with moderation.