My site’s SSL was renewed by DO on 27th December 2018. So the next renewal was supposed to happen automatically on 27 March, 2019. But it unexpectedly expired today.

I don’t know what’s happening. Can anyone guide me on what to do?
My traffic has gone down to zero. I need help asap.

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It depends on how the LetsEncrypt certificate was installed and what problem it is running into. If certbot was used, you can try a renew with:

certbot renew

Then you can observe what error occurs, if any, and figure out how to proceed from there.