Oncidiums in trouble

[OrchidsSweden]

I've had these Oncidiums for about 8 months now, they were never doing great but they keep trying. The Twinkle is trying to grow a new pseudobulb, but at the same time many leaves have been yellowing and falling off. The older pseudobulbs that recently completely lost their leaves are now drying up and dying off as well.

Do you think anything can be done for the poor guy, or is it doomed to fail? The new growth does look healthy so far and it is growing new roots, but I'm not sure it will be enough to save the orchid.

I only have two Oncidiums and both of them are struggling. The other one (I don't have an ID for it) is all shrivelled up and while it attempted to grow a pseudobulb it appears to have given up on it. It has stopped growing.

Both Oncidiums were delivered to me in the same pot as an arrangement, I thought with some attention they would recover.

What to do? I'd be grateful for any help and tips. Also I've got photos from when they were in bloom if anyone wants to try to ID the mystery orchid. Thanks!