Can seo be done in 4days?

Partially, yes. You can do «on-site» SEO Best Backlinks (https://seobests.com) to your webpage – adding keywords, fixing your META tags, validating the HTML coding, etc. This can be done in 24 hours.

On the other hand, Google likes to see backlinks to your site. This part cannot be done in 4 days.

you can do on page optimization for your webpage in 4 days but promoting your sites and getting backlinks and ranking is not possible in 4 days.