IPad Pro backup problem

Hi.

I have an iPad Pro model 2018 - 12.9 inches.  I try to backup all the data I have on it.  But about a year and a half ago my screen was partially broken, but the screen works just fine.  And I also think that the charging port has been damaged with the time I’m using it.

Because every time I connect it to a computer to backup the iPad then the computer does not recognize the iPad at all, not even with another cable.

 So my question is, how can I backup my iPad if the charging port is screwed, and the screen is broken so that it is also problematic to replace a charging port without also replacing the screen, something I do not have money for at the moment.

I would be happy for your help please, because it is very very important for me to backup the data I have on the iPad.  I would be very happy for your help!

TY ALL!