Help with my dendrobium nobile!

[ivymastiff]

I bought this orchid 5 years ago in bloom and I have not been able to get it to rebloom since! Can anyone give me some advice? I feel like I have the worst luck with dendrobiums! It will produce keikis about once year. It's inside during the winter and I have been putting it outside during the summer months. Once it starts to cool down I leave it out for a couple nights before bringing it in because I read the cool weather will help induce blooming. I've kept it in clear plastic pots for years until about a month ago when I switched to pottery. I just don't know what to do with it, I would love to see it blooming again!