Certificate Expiring in 20 days

The requested nginx plugin does not appear to be installed
Getting this result !!

You need the certbot nginx plugin

sudo apt install python-certbot-nginx

Thanks, I got that installed and while I was renewing certificates i got asked this question:

Please choose whether or not to redirect HTTP traffic to HTTPS, removing HTTP access ?

Which one am I supposed to choose if I am just renewing my already working certificates?

Selected 2

  • Congratulations! Your certificate and chain have been saved at:
    Your key file has been saved at:
    Your cert will expire on 2019-10-14. To obtain a new or tweaked
    version of this certificate in the future, simply run certbot again
    with the “certonly” option. To non-interactively renew all of
    your certificates, run “certbot renew”

  • If you like Certbot, please consider supporting our work by:

    Donating to ISRG / Let’s Encrypt: https://letsencrypt.org/donate
    Donating to EFF: https://eff.org/donate-le

Is there any more steps i need to take to renew my certificates ?

Now it looks good.

You have a new certificate - https://check-your-website.server-daten.de/?q=chuo.fm#ct-logs

Issuer not before not after Domain names LE-Duplicate next LE
Let’s Encrypt Authority X3 2019-07-16 2019-10-14 biblio.chuo.fm, chuo.fm, library.chuo.fm, new.chuo.fm, www.chuo.fm - 5 entries duplicate nr. 1
Sectigo RSA Domain Validation Secure Server CA 2019-05-07 2021-05-06 stream.chuo.fm, www.stream.chuo.fm - 2 entries
Let’s Encrypt Authority X3 2019-05-02 2019-07-31 biblio.chuo.fm, chuo.fm, library.chuo.fm, www.chuo.fm - 4 entries

your main domain use it:

expires in 90 days	
biblio.chuo.fm, chuo.fm, 
library.chuo.fm, new.chuo.fm, www.chuo.fm - 
5 entries

Perhaps check your domain in 65 days to see, if the renew has worked.