Since you've inspected with a magnifier and found no mites or webbing—and the nearby Majesty palm has them—your Dracaena's issue is likely root-related, not mites.
Dracaena marginata is prone to sudden decline from root rot, often due to overwatering or poor drainage.
Email a photo to wcreed@HorticulturalHelp.com or answer the questions above for a targeted solution.
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