Cloudflare + Nginx + Certbot: Redirect isn't working from non-www to www

I am super new to Nginx and CF and I have deployed my website to example.com and it is working perfectly and it redirects to https as well. But I want to redirect to www all the time. Right now if I type in example.com it doesn’t redirect to www.

This is one of the million solutions I tried where I added www.example.com in the return statement:

server {

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


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

        server_name example.com www.example.com;
        listen 80;
        return 404; # managed by Certbot

}

But it isn’t working. What is wrong here?

Here’s the full nginx config for the website:

server {

    root /var/www/html;

    index index.html index.htm index.nginx-debian.html;

    server_name example.com www.example.com;

    location / {
        proxy_pass http://localhost:3000; 
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $http_cf_connecting_ip;
        proxy_set_header X-Forwarded-For $http_x_forwarded_for;
        proxy_cache_bypass $http_upgrade;
    }

    real_ip_header CF-Connecting-IP;

}

server {

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


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

        server_name example.com www.example.com;
        listen 80;
        return 404; # managed by Certbot

}

I have enabled Development Mode in CF, tried a million things, asked in Reddit, StackOverflow and ServerFault, none seems to be working. Someone please help me.

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