Orchid losing leaves

[PurplePali]

Hello, I’m new to the forum and new to orchids. I’m ashamed to admit, but I have always been bad with plants. My SO gave me a beautiful orchid for Valentine’s Day, and it had been thriving really well! All of its buds opened and bloomed into a beautiful stack of burgundy colored flowers. The flowers lasted a few months before they started to dry and drop off.

Just recently however, the leaves have begun to yellow and fall off as well. I read online that this may or may not be normal depending on what kind of orchid you have....

I am not sure what kind of orchid I have, but I THINK it’s a Dendrobium type.... (???)

It is potted in an orchid pot with drainage holes, in orchid potting mix, and it receives orchid fertilizer every now and then (according to the instructions). It’s placed near a window, but not in direct sunlight. I live in a tropical area that is pretty humid... I did have a problem when I went to thoroughly water it until the water seeped from the holes... it seemed like the pot never dried out and the soil started to get moldy. I repotted the orchid because I was afraid of the fungus/bacteria. Plus, it was attracting bugs. The roots still looked healthy at that time, so luckily, I don’t think it had rot.

If I’m correct in thinking Dendrobium Orchids lose all leaves when they go dormant (?), so I’m hoping mine is still ok. After the flowers fell off, the spike started to yellow at the end, so I cut it back to the last flower node. It has been staying green now, but I’m not sure if that was right for me to do...

I noticed that the plant has three other smaller/thinner stems that seemed to have been trimmed/cut back. The steam it had grew and budded off of is significantly taller and thicker.

So yeah, I’m not sure what to do now.... Is this normal/is it still alive? Is care for a dormant orchid different than when in bloom - watering, fertilizer, etc...? Am I supposed to cut it all the way down or just leave it as is? Will it grow/re-bloom again? Any suggestions on how to control humidity and mold?

Any help and advice would be very much appreciated! Thank you in advance!