Brown tips and yellowing on this Dracaena are classic fluoride toxicity from tap water. Dracaenas are extremely sensitive to fluoride.
Forget the "twice a month" schedule. Water thoroughly when the soil is dry 2/3 down (check with a bamboo skewer). Empty the drainage tray after an hour. Ensure the pot has a drain hole.
Switch to distilled/aged water and the skewer method; the plant should recover.
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