Anyway, the three remaining ones with developed leaves (a lot more have a tiny bit of "new" leaf) have been trapped in the vortex of time for two years now. NOTHING happens. The old "new" leaves don't change, any brown spots on the leaves don't change...it just sits there, like a sad fake plant that has to be watered.

When I got it, I immediately transplanted with soil from my yard, which is apparently alkaline...whoops. That was probably why they died. Now I water with some orchid food every so often so the ph might lower...is this not a good thing to do? I've been told that the fertilizer would burn the roots, but that was after it stopped visibly dying.

Now it gets bright light, the direct light is blocked by some other nearby plants. The pot is terra cotta.

Thanks in advance!

Gosh, I really have to research these things more...

Did you bake garden soil before potting with it?

Bagged soils are 'supposed' to be sterilized, something yard soil isn't.
Yard soil contains insects, disease, and who-knows-what-else, but nothing good. As far as potted plants go.

Garden soil needs to be baked at 375 for 45 minutes..Soil stinks when baked..

Neanthe Bella's are slow-growing.
I don't believe in over-potting, but when roots fill a pot the plant should be placed in a larger container.
Are roots sticking out of drainage holes? How fast does soil dry? If soil dries a day after it's watered, most likely it's root=bound.
If pot is large, 'more than 2" larger than rootball,' repotting isn't needed.

Soil pH for NB should be about 6.0. Slightly acidic. You mentioned soil being alkaline.

If the palm were mine, I'd remove it from its pot. Check roots. Discard old soil. If rootball is tight-fitting, palm would be repotted in 1-2 size larger container, with drainage holes, in fresh, semi, well-draining soil.
Last, leaves would be showered and soil watered thoroughly..until water seeps out of drainage holes.

Oh, before watering, I'd add slow-release, Palm fertilizer pellets and Superthrive.

Then palm would be set in a brightly lit window. East is fine, or a few feet from west or south..

No, it's not good that new growth is dying. There are many reasons new growth dies. Could be because of soil or over-watering.

Palms don't like wet feet, especially during winter months. Moisture in the air is one thing, 'humidity,' but not wet soil.

Good luck, Toni

Oh, and it probably was overwatering, as it was just about mud at the bottom of the pot. (somehow it didn't spill out onto me. Hmm...)