openVPN server not working

I have installed OpenVPN server using the following guide: https://openwrt.org/docs/guide-user/services/vpn/openvpn/server
setup completed successfully and it worked perfectly with my android and Windows machine, I was able to use the openVPN client and was able to access my home network using .ovpn config file.
I am using OpenWrt 23.05.5 in my tplink c6 v3 router.
I had trouble connecting to VPN few days ago and reinstalled everything as per the guide multiple times. However I am not able to connect to my router from outside network anymore. I get connection timeout error in openVPN client. There is no much info in the log file.

Can anyone suggest how to I start the troubleshooting or provide an alternate VPN that I can install and use to connect to my home network from outside.

Wireguard is much faster and easier to setup

Install luci-proto-wireguard, wg-installler-client and wireguard-tools

See the road warrior setup: https://openwrt.org/docs/guide-user/services/vpn/wireguard/road-warrior

Is there anyway to fix openVPN first, I have been using it in multiple devices and would like to try resolving it first before jumping to different VPN

I would start with checking if your WAN IP has changed

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I have DDNS service, also I have tried with the WAN IP, still does not connect.