This part is pretty straightforward;
You absolutely must setup Google Search Console for your site, in order to see how your site is indexing, and to make adjustments to your SEO performance. Without this, you're driving a car with a blacked out windshield and no steering wheel. Good luck with that.
Now, start building backlinks, from other sites, to yours.
Making your site visible to the world directly, through other sites, also makes it visible to Google. And it adds relevance too.
Time to grind.