Oncidium (Wilsonara) Lisa Devos 'Burgundy' won't bloom

[D_novice]

It looks overpotted to me. It may want to put all its energy into filling that big pot with roots. If you want to hurry it along you could try repotting it into the smallest possible pot that will hold its roots.

That and more light is the standard advice. Some uncrowded plants bloom, but tight in their pots probably works better.

Nice looking plant and collection!