How to setup prerender for nginx?

Question

Nginx

I use nginx + laravel + react.js, there was a problem in SEO.
I decided to use prerender.io

The prerender itself works well, but now we need to connect this whole thing to nginx.

Here is a link to the nginx doc.

Here is my config:

server {
    listen 80;
    server_name www.mysite.com mysite.com;
    root   /var/www/mysite.com/public;
    index index.php;
    client_max_body_size 10M;

    location / {
        try_files $uri $uri/ /index.php?$query_string @prerender;
    }

  location @prerender {
            proxy_set_header X-Prerender-Token YOUR_PRERENDER_TOKEN_GOES_HERE;
set $prerender 0;
            if ($http_user_agent ~* "baiduspider|twitterbot|facebookexternalhit|rogerbot|linkedinbot|embedly|quora link preview|showyoubot|outbrain|pinterest|slackbot|vkShare|W3C_Validator") {
                set $prerender 1;
            }
            if ($args ~ "_escaped_fragment_") {
                set $prerender 1;
            }
            if ($http_user_agent ~ "Prerender") {
                set $prerender 0;
            }
            if ($uri ~* "\.(js|css|xml|less|png|jpg|jpeg|gif|pdf|doc|txt|ico|rss|zip|mp3|rar|exe|wmv|doc|avi|ppt|mpg|mpeg|tif|wav|mov|psd|ai|xls|mp4|m4a|swf|dat|dmg|iso|flv|m4v|torrent|ttf|woff|svg|eot)") {
                set $prerender 0;
            }
            resolver 8.8.8.8;
if ($prerender = 1) {
                rewrite .* /$scheme://$host$request_uri? break;
                proxy_pass http://localhost:3000;
            }
            if ($prerender = 0) {
                rewrite .* /index.html break; 
                proxy_pass https://mysite.com;
            }
        }

    location ~ \.php$ {
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass unix:/run/php/php8.0-fpm.sock;
        fastcgi_index index.php;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    }
 
}

I change user agents, but nothing changes ((
Question - what is wrong with the config and how to configure it correctly?