As your domain approaches its expiration date, you'll notice the following banner on your LaunchMyStore web dashboard, indicating the remaining days until your domain expires.
just go to your domain company website login your account and renew your domain.
after this go to your store and refresh your domain. your domain will be activate again.
and just read this article and follow this method step by step to renew your custom domain.
https://launchmystore.help.center/article/1029-how-to-link-my-custom-domain-to-launchmystore
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