I know similar questions have been asked many times in many different forms before, but I couldn't find any that suited my needs.
I recently made a connect-four game in python, and I thought it would be cool to make it online, so two people on different networks can connect and play against each other.
Doing some research, I found that the easiest way is to enable port forwarding on my router. Unfortunately, that is not an option for me. I have also tried doing uPNP, but it didn't seem to work ("The Internet Gateway did not accept your changes" (Windows 10)).
So my question is this: Is there any way to access my Raspberry Pi or use it as a server without enabling port forwarding?
If someone knows how to solve the error above, I will also accept that as an answer.