There are a number of ways through which you can boost your chances of being approved for Google AdSense. You should make sure that you write more useful content on your website and not just add many posts to your site. Google also takes into consideration content quality, usability, accessibility, and compliance with the publisher guidelines of Google.
Make sure that your website is up and running, is easily navigable, has important pages such as About and Contact, uses HTTPS, and has no broken links or pop-up ads. You should also ensure that the Google bots can access and crawl your website without problems.
There is no set minimum traffic level or age of website needed for getting approval from Google.