Failure to bloom is almost always a lack of light. People are mislead because orchids are found in jungles that they need a shady area. In fact, orchids live it the canopy of the forest high up where they get large amounts of sun.
Southern California summer sun is about 10-11,000 foot candles at noon.
Light levels vary depending on the family of orchids but for examples
Vandas in California can take almost full day sun without any shade. 6-8000 foot candles. I grow my Vandas in full sun with only a little shade from 1-4 o'clock.
Cattleyas and dendrobiums of which you probably have some need 3500 foot candles. Full morning sun with afternoon shade works.
Oncidium alliance about 2500.
The first thing you should do is measure the light in every spot where you have an orchid to learn with what you are working.
Measurement can be done easily with a camera.
Measuring light levels with an SLR camera
while the article says a SLR camera, any camera will work. You just have to be careful you have only the sheet of paper in the view of the cameras sensors.
Blooms will come from new growth. On a mature plant, almost every new growth should produce flowers.
It is unlikely that you have any exotic orchids that have special requirements since they are not easy to buy by accident. A good nursery selling you an orchid with special requirements would have told you when you purchased it. It is not realistic that every plant you own could fall in this category.
I would be concerned about any orchids that are not showing new growth. Every orchid should put up 1 or more new growths this summer. Most are starting around now. An orchid will occasionally skip a season but it is not a good sign. Usually it means the medium in which it is planted is no good.
But check the light first. This is where the problem usually starts.