The internet is a very big place so sometimes when a fresh new site like yours is released into the wild it can take quite a while for Google to discover that site and index it.
For Google to discover a site, your domain has to be listed on other public websites sites and directories.
If you still aren't seeing results in google your best option is to setup your site in Googles Search Console and submit your sitemap
Log in to Google Search Console
Go to the right property
Click “Sitemaps” on the left menu
Paste in your sitemap URL (https://yourcustomdomain.com/sitemap.xml)
Click “Submit”