I have 4 orchid cactus which I have had growing for about 5 years. I have them all in a south west window where they get the best light in the house. So far, I have NOT gotten ONE

bloom on any plant! I have had it... I want blooms.
My christmas cactus, zygo and heirloom, all bloom their little heads off, basically from late October to April or even May. The heirloom is a start off a christmas cactus my great-great-aunt gave to my great-grandmother for her birthday in January 1920. Yup, 90 years and going strong! So, obviously I can keep plants up.....

There is very little info online about these plants. I don't know what else I can do to get them to bloom.
I fertilize every two to 4 weeks in winter with a dilute liquid fertilizer when the CC's are in bloom, and let all of them dry out before I water. I got them from my cousins and they are red, yellow and pink colors. supposedly.....can't verify that for sure.

Do any of you have any words of wisdom on how to get them blooming, or is my house just too dark with not enough windows and I am not going to be successful at getting them to bloom.