Dendrobium keiki not developing

[Irisha99]

Hi, guys.
So, my dendrobium produced 4 keikis but they don’t seem to be developing much anymore. The temperatures ranges from about 70 to 80F. Humidity is in the 50-60s. I water it every 4-5 days or so, it’s growing in bark and I got some sphagnum moss on top. I add about 1/4 the recommended dose of fertilizer (20-10-20) every 2 weeks. However, the keikis seem to have stopped growing/developing. One of the canes browned because I think I overdid it with the moisture level ( I put a bag over the top and the cane started browning). Is there a way to make keikis grow? Or should I save the mother plant? Thanks for your help