How do I exactly introduce my topic and my curiousity about it? (the topic i'm doing is on how rona had a bad impact on ppl's mental health) Can you give me some examples?? (if you saw my other question it was a typo sorry)

I think you should start it out like this:

The (virus) has shifted the way the world works. It has caused cities to go on lockdown, shops and stores to close, and many other issues.

Then add:

It also raises a question, does this virus have a negative impact on people's mental health?

or

With research, I have come to the conclusion that (virus) is damaging the mental health of people worldwide.

You can approach it by saying the question and then answering it, or you can say your claim and provide evidence and reasoning.

Hope this helped!