In your case, I'll check :
1- Technical SEO issues : check if your main pages are indexed. Also, how long is the indexation after you publish a new article? If it takes a long time, or worse, the article is not indexed at all, you have a huge site health problem which needs to be fix asap.
2- Keywords Research : as your site seems new, you should focus on writing good articles focused on low competition keywords (as IM Dude said), it should help ranking your site on these keywords and overtime gain traffic. But before doing that, check your site health, because it is the foundation of your website.
3- Meta title and description optimization : after you've done site health optimization (if needed) as well as written and published some good quality articles focus on long tail keywords, you can optimize your meta title and description to boost your CTR and ranking even better for your targeted keywords.
Just a reminder for metas :
- only meta title can be optimize for keywords, meta desc is only useful for user (can boost CTR)
- You should focus only one keyword in your meta title, the one you want your page to rank for
- keep your metas relatively short in order for them not to be truncated