bubble of the artist I was subscribed to has been paused. How can I maintain my subscription date.

Please check the artist’s bubble service temporary suspension and reopen notice.
If you were subscribed during the period specified in the notice, your subscription date will continue to be counted when the artist returns.
(Members who subscribed during the period specified in the announcement will receive the same benefits based on the subscription days.)

However, after the service reopens, for once only, your subscription date will be maintained if you resubscribe within the resubscription grace period.
*Resubscription grace period: FAQ > Questions on DearU bubble > Service Inquiry > “What is a resubscription grace period?” Reference

※If the subscription date was reset due to your negligence (e.g. if you changed the ticket or artist), you cannot maintain or restore the subscription date.