Google Indexing Issue

I have a new website. I have submitted my site in google. It successfully got indexed. But when I started to publish my post it doesn't crawled or indexed. Here an information of my post publication -

[1st post -------- 24/07/2021],
[2nd post -------- 05/08/2021],
[3rd post -------- 06/08/2021],
[4th post -------- 07/08/2021],

I know that it takes time to be crawled and indexed. Other pages on my site like about us, contact and privacy policy shows on google. My first post published almost 15 days ago. It didn't even crawl. Why this happen and what should I do for getting indexation?