Why my web pages are not indexing by google

Hi everone, I run a small business and trying to some basic work on SEO, **My website is builed with Hostinger**(all ready ask CST to help, but what they said is not helping) My domain is pointing correctly, and the website is published, all pages are created before 12/21 Now I can see 3 pages are indexing in GCS, however I still have 13 pages are not indexing( included the above mentioned 3 pages) Reason: Discovered - currently not indexed All these pages are info about my service and blogs, I should think they are not as bad as *useless content* what can I do to solve this problem? Thankyou