ERR_TUNNEL_CONNECTION_FAILED for my website after installing new SSL certificate

Question

My website groceryshoptest.com was hosted in Digital Ocean droplets with a Nginx server. I've used free SSL from Lets encrypts certbot, I've just put few commands which added some configuration in etc/nginx/sites-available/groceryshoptest file and installed certificate everything was working fine. Later I decided to move my server to Linode. So I've stopped my previous server, pointed my DNS to my new server address, installed everything and it was working fine over http. Then I again installed certificate from Letsencrypt in my new Linode server. It showed me everything installed successfully. So my problem is I can access the site from Bangladesh but can't access from USA following error in browser

ERR_TUNNEL_CONNECTION_FAILED

My config file is here

 server {
    server_name groceryshoptest.com;
    root /var/www/html/shop;
    index index.html;
    location / {
        try_files $uri $uri/ /index.html?$args;
    }

    listen [::]:443 ssl; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/groceryshoptest.com/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/groceryshoptest.com/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot


}

    server {
    if ($host = groceryshoptest.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    listen 80;
    listen [::]:80;
    server_name groceryshoptest.com;
    return 404; # managed by Certbot
}