Try this site conf if you (use SSL/TLS certificates by letsencrypt certbot for nginx and) want to redirect http: to https: and www to non-www

https_non-www_letsencrypt.nginx.conf

server {
    # Listen for http:
    listen [::]:80;
    listen 80;

    # Handle . and www.
    server_name example.com www.example.com;

    # Redirect to https:
    return 301 https://$host$request_uri;
}

server {
    # Listen for https:
    listen [::]:443 ssl;
    listen 443 ssl;

    # Use letsencrypt certificate
    ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;
    include /etc/letsencrypt/options-ssl-nginx.conf;
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;

    # Handle . and www.
    server_name example.com www.example.com;

    # Redirect www. to .
    if ($host ~* ^(www)) {
        rewrite ^/(.*)$ https://example.com/$1 permanent;
    }

    # Serve the request
    # (Edit if needed)
    root /var/www/example.com/html;
    index index.html;
    location / {
        try_files $uri $uri/ =404;
    }
}