Increasing Google organic traffic

Content is what you need. And not any type of content but content that helps people out, that answers questions people have and that solves issues for people. The more of this type of quality content that you start publishing, the more content archive that you will build and the higher the chances that Google will send you some traffic.

So put yourself in the shoes of the audience you are targeting (you can also do keyword research if you're not that familiar with your audience).

Who are they? What questions do they have? What problems do they want to solve? Then create the best content that you can by being 100% focused on them. No need to "sell" anything. Just provide great value to people.

When you publish something new then go out to relevant communities that you are an active member of and try to spread the word about it. Visitors, social media shares, links, comments etc will start coming in.

Do that consistently over a period of time and your search traffic will start growing. It's not a get rich quick scheme so have realistic expectations.

You are not targeting enough keywords, that's one of the main issues. And this points to a second issue that there is not enough content. Google needs more information about your site and values websites that cover subjects in-depth. I suggest doing proper keyword research, planning out content, and then linking them together. This alone (assuming you choose the right keywords) will accelerate your growth in the next 6 months.

Blog posts with targeted keywords. Basically, getflookuk's first thing :-)
I didn't have a clue to begin with, but I watched the Ahrefs video series that they have made free during these times. It's very practical. You don't have to use their paid keyword product, there are free ones out there that do similar.
https://ahrefs.com/academy/blogging-for-business