Taking another look at your plant pics -
Your plant looks very lush and green and I would definitely not thin it out. But I would try to get it used to brighter light.These type of Phrags can take bright light under the equator!
Also, adding some cleaned Oyster/Clam shells to the medium is not a bad idea, mimicking the Limestone hill of its ancestors.
And happy you, these type of Phrags bloom more than once a year!