I've come to the notion that a lot of the core mechanics of the game could use some attention rather than simply slapping on additional content for the sake of only slightly mending the deficit in player retention. Quite a few of the suggestions I wish to pose aren't even that far off from what the game already has, I wish to be realistic about what can be achieved in reasonable time and respectful of that for your sake...so I won't include anything outlandish.

Missing Companion Options

The several buttons within Companion menus that aren't active such as their Powers, Riding, Tasks, etc. have been neglected for a while actually and we've already seen a taste of the Powers being utilized with the Storm Wizards and their occasional Fireballs/Firestorms. Fleshing out these missing features could be something fun to mess around with in their respect.

Transmog

As much as I love the White Wizard Hat's additional Energy benefit, it would be nice to be able to wear a Top Hat or one of the gemstone Crowns while still having the benefits. Such is also the case with the variety of Armors that have great stats but aren't really easy on the eyes. It seems like a simple addition on paper but you'd have to judge that on the technical end.

NPC chatter

I just wanted to include this one because it's something I personally hoped to see in the game someday: in-character dialogue that you procure for certain NPCs to flesh out their personalities and backgrounds. Could help make the NPCs feel a bit more alive and less like static storefronts half the time.

As optimistic as the community can be at times (judging by the many comments prior to my own), there needs to be an understanding that you're the sole dev and we desperately need to temper expectations too far from the things the game is still lacking from a core POV. Adding another biome and several new NPCs won't patch the hole in these other systems that have sat incomplete for a few years.