Just adding my voice to the consensus here, the game needs its systems/mechanics worked on in a major way before more content is added, if only because building "story locations" on an unfinished foundation WILL prove to be a major problem in the future. Personally, I'm most interested in world generation (rivers, mountain ranges, slopes, valleys, getting rid of paraboloid hills and weird cliffs with regularly spaced edge walkways) and seeing some work on a Distant Horizons functionality (I don't care snow interferes with it, this is such a killer feature you need to figure it out, besides it would likely help the janky seasonal snow mechanics in unloaded chunks too), but also:
The Discord suggestions forum is full of good ideas.
The ModDB is full of good ideas.
Please, the game feels like it's stagnating or developing in directions most of the audience doesn't enjoy.