I reside in an apartment complex where the internet services are not controlled by the management, but instead, they are managed by our ISP, Telcom. Unfortunately, Telcom restricts certain functionalities for users, such as not helping with the opening of ports or providing the admin username/password for my router. Additionally, my router doesn’t appear on the network tab of file explorer. Given this situation, what options do I have to address these limitations to port forward?
The fact that you said “my router doesn’t appear on file explorer” tells us everything we need to know about your skill level. You don’t know the first thing about “protecting this open port” and you aren’t qualified to assess the security risks of what you are trying to do.