BIND9 DNS Issue : connection timed out; no servers could be reached from outside network

I am learning Bind9 and have setup Bind9 on Ubuntu 20.04.3 LTS

Here is named.conf file

options {
    directory "/var/cache/bind";

    listen-on { any; };

    listen-on port 53 { any; };

    allow-query { any; };

    forward only;
    
    forwarders {
        1.1.1.1;
        1.0.0.1;
    };
    response-policy {
        zone "example.co";
    };
    
};

logging {
        channel rpzlog {
        file "/var/log/named/rpz.log" versions unlimited size 100m;
            print-time yes;
            print-category yes;
            print-severity yes;
            severity info;
        };
    category rpz { rpzlog; };
};

zone "example.co" {
      type master;
      file "/etc/bind/db.example.co";
      allow-query { any; };
      allow-transfer { any; };
};

db.example.co file

$TTL 1w    ; default TTL = 1w
           ; TODO: should be adjusted to frequency of list updates

@   IN  SOA ns64.domaincontrol.com. root.ns64.domaincontrol.com. (
            2019102401      ; serial yyyymmddvv
            1w              ; refresh (match default TTL)
            1w              ; retry (match default TTL)
            1w              ; expiry (match default TTL)
            1d              ; negative caching
        )
@   IN  NS  ns64.domaincontrol.com.
@   IN  NS  ns63.domaincontrol.com.

; ***** START OF BLOCKLIST *****
wizhumpgyros.com CNAME .
*.wizhumpgyros.com CNAME .
coccyxwickimp.com CNAME .
*.coccyxwickimp.com CNAME .
n2019cov.000webhostapp.com CNAME .
*.n2019cov.000webhostapp.com CNAME .
webmail-who-int.000webhostapp.com CNAME .
*.webmail-who-int.000webhostapp.com CNAME .

If I do nslookup in local network, (like if I connected with same network) then it will work fine

Here 180.19.161.147 is my public IP.

nslookup google.com 180.19.161.147

output is:

Server:     180.19.161.147
Address:    180.19.161.147#53

Non-authoritative answer:
Name:   google.com
Address: 142.251.12.102
Name:   google.com
Address: 142.251.12.113
Name:   google.com
Address: 142.251.12.138
Name:   google.com
Address: 142.251.12.139
Name:   google.com
Address: 142.251.12.100
Name:   google.com
Address: 142.251.12.101
Name:   google.com

But I connect with another network

nslookup google.com 180.19.161.147

output will be like

;; connection timed out; no servers could be reached

from router side my port 53 is open

if I use below command

sudo ss -lntp | grep 53

output is like

LISTEN 0      10                          192.168.2.237:53         0.0.0.0:*     users:(("named",pid=32020,fd=55),("named",pid=32020,fd=54),("named",pid=32020,fd=53),("named",pid=32020,fd=52),("named",pid=32020,fd=51))
LISTEN 0      10                              127.0.0.1:53         0.0.0.0:*     users:(("named",pid=32020,fd=46),("named",pid=32020,fd=45),("named",pid=32020,fd=44),("named",pid=32020,fd=43),("named",pid=32020,fd=42))
LISTEN 0      4096                        127.0.0.53%lo:53         0.0.0.0:*     users:(("systemd-resolve",pid=566,fd=13))                                      
LISTEN 0      4096                            127.0.0.1:953        0.0.0.0:*     users:(("named",pid=32020,fd=36))                                              
LISTEN 0      10     [fe80::24a3:8c4f:dd63:8238]%wlp1s0:53            [::]:*     users:(("named",pid=32020,fd=74),("named",pid=32020,fd=73),("named",pid=32020,fd=72),("named",pid=32020,fd=71),("named",pid=32020,fd=70))
LISTEN 0      10                                  [::1]:53            [::]:*     users:(("named",pid=32020,fd=65),("named",pid=32020,fd=64),("named",pid=32020,fd=63),("named",pid=32020,fd=62),("named",pid=32020,fd=61))
LISTEN 0      4096                                [::1]:953           [::]:*     users:(("named",pid=32020,fd=75))        

This might be duplicate question of Bind9 not responding to outside dns queries while port 53 is open but I did not get any solution from there as well.

Please help me, thanks in advance.