Did you try “beyond skyrim: bruma”? Its only one province of the planned entirety of tamriel, but that was many excellent hours of exploration, and it feels like the plotlines are really going somewhere, whenever they get finished with the rest of cyrodiil. Shame there are some places that feel unfinished (because they involve other provinces), but that mystery made it more intriguing, in my opinion.

Also, it has a soundtrack that I actually like more than the original skyrim soundtrack, and that is saying something.