If you have used Letsencrypt certificates to enable HTTPS on Spotipo following this article, you will need to renew them every 90 days.
Fortunately renewal is easy, just execute below command
sudo certbot renew
Once its succeeds, restart the nginx
sudo service nginx restart
Problem binding to port 443: Could not bind to IPv4 or IPv6
If you see an error like above, it's caused by certbot ran in standalone mode.
Such case follow below steps
sudo service nginx stopsudo certbot renewsudo service nginx start