SEO review and feedback for my Greek Travel website

I've been running my website, https://www.greecetravelguide.co.uk/, for several years now as a hobby. Although I don't monetize the site at the moment, I would like to get more visitors and therefore am looking for someone to review the website content and structure from an SEO perspective.

It's a Wordpress site so ideally, I would like someone with experience optimizing Wordpress given how it works with pages, posts, categories etc. I have plugins like Yoast SEO but not the premium version and honestly, I'm probably not using it fully.

I've written all the content myself and will continue doing so for now, but fear I might be missing out on traffic due to the way the site is structured. Essentially, my content boils down to several main types:

1. Blog posts from previous trips.
2. Reviews of hotels that I've visited.
3. Guide pages to the islands I've visited.
4. Other general posts such as tips on when to travel, budgeting etc.

Although #1 makes up probably 70-80% of my content, I realise this isn't likely to rank highly. It's #2 and #3 where I would like to get more traffic.

My budget is modest but what I'd like to get from the project is:

1. An understanding of where my site falls down in terms of SEO.
2. Some clear feedback on steps that I can take to improve it.

I am a web developer so quite technical and happy to discuss any advanced topics like plugins or customization to Wordpress themes etc.