Ask HN: How to get better Google search ranking for a set of keywords

I've created a simple site (https://funnyzoombackgrounds.com/) as an experiment. I want to see what it takes to get higher on google search for "Funny zoom backgrounds". The domain name was chosen deliberately to be the same as the keywords. The site does what the name suggests, no ads, no scams. what I did so far: - added the site to search.google.com - tried a simple product hunt post

Any tips on what else should I try? Thanks