Your houseplants are dying for one very boring reason
It is not light, it is not neglect, and it is definitely not bad luck.

Ask any plant shop and you will hear the same diagnosis before you finish describing the symptoms: it is the pot.
Decorative containers without drainage turn every watering into a slow root drowning, and the visible damage arrives weeks later.
The five-minute fix
Keep the nursery pot, drop it inside the pretty one, and lift it out to water. That single change resolves most cases.
Repotting into fresh medium once a year handles almost everything else, including the compaction nobody notices.
Everything after that is fine-tuning: light, humidity, and resisting the urge to intervene.
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