Let’s list some points down, shall we?
First, you talk about what a mask is and the reason this topic has come up for discussion.
now all you have to do is explain why you should wear a mask and explain the advantages. Best if you explain how it keeps you and people around you safe.
[Some advantages can be that, the material prevents pathogens from entering your body through you nasal cavity and mouth (which is the most common way Covid-19 gets in your system), it keeps from other people getting sick by keeping your pathogens to yourself and get eliminated by your system— reducing risks of the disease spreading, etc… ]
Actually, that’s pretty much it. If you want to increase your word count you can add a lot of adjectives and a few long conjunctions (in the picture attached).
Hope this helped. Lmk if you have any more questions:)