My orchids are not blooming

[cakmak]

I have purchased this orchid six months ago. At the time of purchase it did not have any flower. I had changed the barks inside the pot but the pot itself remained the same until now. Two months ago it started to grow a spike (see the picture). The spike did stop growing. There is no grow for the last two months.

Humidity of the room where I keep it is around 65% and the temp is around 22 C. The room is facing north and not getting any direct sunlight at all. I do the watering between 7-10 days. I use a fertilizer once a month (see the picture). Again pour some of this fertilizer in water and spray some every morning to the leaves of my orchid. I open the window 2-3 times a day to let fresh air in. The pot was by the window and beneath was heater. I moved the pot from there to a table near the window.

I have got a few other orchids. I had applied keiki and two months later they started growing buds. Some of the buds are turning yellow (see the picture).

What do I really have to do for them to bloom? What am I doing wrong? Please advice me something.

thank you in advance.