[Need Experience] How do you write a guest post?

Hi,
Usually, guest post sites will have DA more than your sites. So if you write a guest post with your keyword, it will have a chance that the guest post site will outrank your sites, especially in the low-competitive keywords. How do you deal with this situation? Any ideas?
Thank you.

It will be beneficial as long as your site is linked to the article

To me that mean nothing, you either write on a different keyword or you leave on the same keyword you both can still take the first page

You might just need more links to the page when that happen