Hi Sherin - Welcome to the Atlassian Community!
This is just a warning message that your subscription is going to end soon. It is not an error with the board.
Welcome to the community @Sherin Grace
This is because you are using the free trial version of the Standard plan in Jira. You can either manage your billing to continue the usage of standard plan or to downgrade to the free plan.
Reference can be found here: https://community.atlassian.com/t5/Jira-Software-questions/Free-version-met-the-error-Jira-Software-will-be-deactivated-in/qaq-p/2561663
This is for the free version, but the process is the same.
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