Restart putty centos webserver?

Question

CentOS

Installed certificate
[[email protected] certbot]# ./certbot-auto certonly --agree-tos --preferred-challenges http-01 --http-01-port 54321 --standalone -d domain -d domain
Saving debug log to / var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator standalone, Installer None
Cert not yet due for renewal
You have an existing certificate that has exactly the same domains or certificate name you requested and isn't close to expiry.
(ref: /etc/letsencrypt/renewal/domain.conf)
What would you like to do?
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1: Keep the existing certificate for now
2: Renew & replace the cert (limit ~5 per 7 days)
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Select the appropriate number [1-2] then [enter] (press 'c' to cancel): 1
Keeping the existing certificate
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Certificate not yet due for renewal; no action taken.
but it did not appear on the site itself, the connection is not secure, what should I do and what should I do? if you need to restart the server, how to do it? I ask for help