Best way to Prevent/Report back on Accounts that are inactive?

Best way to Prevent/Report back on Accounts that are inactive?

I'm quite open on the best way to do this.

Lets assume we have an Account that cancels their contract with us. We want to keep them in ManageEngine but we don't want engineers to be able to create tickets against the accounts.

Is there an option for this somewhere or a way to do this?

Thanks!
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