A- Improve Search Engine Results Pages (SERPs):An improved Alexa ranking correlates with improved rankings in the search engine results pages (SERPs), which means taking steps to improve your Alexa rank can improve your Google rank as well.
B- The easiest way to get backlinks: Website owners like to engage with reputable websites to improve their ranking. So easily exchange backlinks by improving your ranking in Alexa.
C- Advertising :Some advertisers still look at a site’s Alexa ranking to estimate site quality, authority, and traffic.
D- Be #1:Let’s face it, we all want to be #1. A website with a higher ranking looks more trustworthy to the customers.