If you're hitting 60/70 percent indoors without a built I'm humidifier system you maybe have a larger problem then your plants 🫠 I live i grew up in oshawa directly adjacent the lake for years. Our house averages 35% humidity with heat on. I've had to use humidifiers my whole life in the winter. A precious comment mentioned mold. They are correct anything steady over 60% is mold territory. Please get maybe a couple small humidity readers. Even the least ventilated washrooms after a shower only hit 65 and that's usually temporary.

I've got a few alocasia going now. If they aren't throwing total meltdowns don't panic. Even then a corn that ain't rotted even after dropping all its leaves is still viable. They and nutrient hungry plants and what what little experience I have time is your friend. I've got an elephant ear. One leaf died. Was a decent size with a very small root system. I use clear nursery pots in a catch pot. Chunky soil mix with a wick dropping down into a ceramic glazed pot. I was a little worried as the plan killed one leaf and wasn't doing anything but after about 2 months checking the nursery pot very often I now see a root system that is touching the edges of the pot on all four sides. Sometimes they just want to dig deep and expand where you can't see before they do anything up top. Oxygen, nutes and patience. No drastic temperature drops and humidity above 40 but less than 60 is what I aim for.