By any chance, if there is any possibility to add meta box for on-page SEO. We can think of a similar meta box that is created after activating SEO yoast plugin.

Let me say, current post body and templates are amazing, Just as a suggestion if we can add on page part like meta title, meta description and meta keywords, that would really help.

Am not 100% sure if we can setup plugins like yoast plugin or we development team doesn't prefer that, then we can create custom fields and map it with every post.

In order to achieve this change. We can start identifying metas for every post including alt or any on page suggestions and form a team to start fixing the same.