Which one should I do next?
I'm pretty much done swords at this point. I've been just refining them all a bit before moving on to the next weapon type. I think I'm going to release a sword replacer mod in the meantime.

Well, if you're getting tired of swords or one-handed stuff altogether, I'd suggest trying out Bows for a different feel/experience than the one-handed stuff.
If, however, you're just tired of one-handed stuff and don't feel like doing Bows then start something two-handed.
Personally, if I didn't feel like doing Bows or any 2H stuff yet, I'd go to maces (it's a bit different than the blades of Swords). It provides some more unique experience. I like organization so I'd probably strive to get through all the 1H stuff, then the 2H stuff and then bows (in that order) if it were me personally working on these things. But that may just be me

But whatever you start, finish it and let it be out of the way (so you don't end up jumping back and forth between unfinished bows and axes and 2h swords and winding up confused and dismayed and such).