There are some important conditions to meet for AdSense approval.
First of all, You should create unique, high quality content (at least 20-30) for your website.
The website should be mobile friendly and fast loading.
There must be a privacy policy, about, contact page.
There should be no copyright content, illegal content and additional ad blocks.
It is better if the domain is at least 1-2 months old. If you update content regularly and they have good user experience, the chances of AdSense approval increase a lot. Best wishes!