SSH change port to 2021

Hi , ive installed ubuntu and doing some security stuff.

non root- done
ssh key - done
fail2ban - done
now im stuck at changing the port.

these are my steps.

sudo nano /etc/ssh/sshd_config , edited the port >
reboot server.

ssh -p 2021 [email protected]>
i receive error : ssh: connect to host myip port 2021: Connection refused

strange part is that i check the status it shows port 2021 active

[email protected]:~$ sudo netstat -tulpn |grep sshd>

tcp 0 0 0.0.0.0:2021 0.0.0.0:* LISTEN 1013/sshd: /usr/sbi
tcp6 0 0 :::2021 :::* LISTEN 1013/sshd: /usr/sbi>

so i open the firewall

sudo iptables -A INPUT -p tcp --dport 2021 -m state --state NEW,ESTABLISHED -j ACCEPT
sudo iptables -A OUTPUT -p tcp --dport 2021 -m state --state ESTABLISHED -j ACCEPT>

still cant go in. what am i doing wrong .?