Make a cron job that regularly refreshes the SSL (Let’s Encrypt certificate).

Make a script eg letsEncrypt.sh

/home/certs/letsencrypt/letsencrypt-auto certonly --keep --webroot --webroot-path /srv/users/serverpilot/apps/website1/public/ --register-unsafely-without-email -d website1.be -d www.website1.be
/home/certs/letsencrypt/letsencrypt-auto certonly --keep --webroot --webroot-path /srv/users/serverpilot/apps/website2/public/ --register-unsafely-without-email -d website2.be -d www.website2.be
service nginx-sp reload