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Hello, Thanks for reaching out.
This could be related to various reasons.
– the validator you delegated DOT to, has gone offline
– the validator has changed his commission policy and now takes a 100% commission
– the validator is oversubscribed
For more information please refer to this article https://support.polkadot.network/support/solutions/articles/65000170805-why-am-i-not-getting-staking-rewards.
I would suggest following the steps mentioned in the articles or you can reach out to Polkadot team directly as they will guide you correctly towards resolving your issue.