Another news and guides website (competitor) emailed us asking to purchase or trade a backlink, what should I do?

We have a gaming news and guides website and a competitor site emailed us asking to purchase a link, do a link exchange or publish a guest post.

That's why we would love to propose one of the following options: - We purchase 1(x) lifetime Do-Follow Backlink on example.com ( Please provide the price) - We do a 1-1 Link exchange if you are interested into that. - We would love to publish a guest post on example.com In fact we have over 31 Gaming writers covering all sorts of games such as CS:GO, LoL, Fortnite, Rocket League and Valorant. 

Their DA is 40 while our is just 7, what do you guys recommend I should do?

Thanks!