That site is trash. Loads forever and all I can see are ads all over the place. Move on, enough link hunting. Another thread with live link will mean ban for you @alecia

The page takes a long time to load, the posts are missing such things as the table of contents. First of all, I would take care of the onsite work because it is important...

The issue is already addressed in previous thread, https://www.seoforum.com/thread/my-blogging-website-pages-not-indexing-on-google for the same site.

Thankyou for sharing your opinion.

In Google Search Console there is a section of Removals. All unwanted URLs can be removed from the Google's cache. After this, apply for review by making them fixed in GS...

Thank you for your answer @binayjha ! The problem that I'm facing ATM is that those attachment pages don't exist anymore in my back end (can't see them in wp-admin at all...

Comments backlinks are important as they generate traffic to the website though most of them are no-follow links. But it still has importance.

It is imperative to invest in seo. You have to get the knowledge yourself or outsource it to an external company. Without it, there will be no satisfactory results.

Always the most important and best backlinks are the ones that generate ruh to your website. Such links will always work.

Few steps need to be taken, Check whether those images are getting called on any page of the website, then remove those. By default WordPress create pages for each image...