The key words here are "direct sunlight" which your orchid will not get through tinted windows, unfortunately.
You may want to take it home or find a better place to grow it, where you can give it better light conditions. Somebody with a terrace or lanai that faces the morning sun (eastwards) might let your orchid "camp" there until it starts to show buds again.
Without enough sunlight, it's very doubtful you will see more blooms no matter how well you care for it.
