what if there's an option to segregate posts in our 'Blog' into categories
That's covered by tags (#art #poetry #steemit etc.).
What we need is a general design makeover. On Steemit content needs to be pro-actively searched, instead of being actively offered. There is no user retention, no incentive for staying on the site. On YouTube content that is related to the one you clicked on is actively offered for instance.
Yep, but since the tags can't do much about old content getting buried in our Profile, pins in a user's Blog could make it somewhat easier to find posts according to category.
Youtube-styled curated suggestions will definitely keep the users hooked. However, there's also the disadvantage of lack of diversity in opinions consumed by them. Meaning, they would be shown only one 'side' of the story. If the content suggestions are constantly shuffled, then it could be a great add-on.