How to do SEO for Coupon Websites

I run a Udemy Coupons website on WordPress where I share free coupons for Udemy courses.

Need advice on optimizing my website for SEO, Where the content remains the same but the coupons change each time

For eg. I got one discount coupon for Udemy Course, after few day instructor change their coupon for the same course, so I just edit the page with new coupon and change the published date so that post gets update and show on front page.

I cant create a new post every time with new coupon code. bcoz just coupon is change not the whole content.

P.N 1. Udemy coupon is valid only for 48 house thats why instructor will need to change the coupon code again.

Any suggestion is highly appreciated.