Once your webite is ready....

Then the work starts:

1) put it on Cloudflare,

2) make sure it has a XML-sitemap,

3) set-up automatic SEO tags.

4) push it to Google, Bing and Yandex

5) crreate links to different pages from another popular website you have to the new website (preferably on the homepage !).

6) SEO becomes more and more difficult nowadays, so really you'll need links, blogs, etc to get visitors and authority.