Cancel the order as you are wasting your money.
I would do this before you spend money on any cables, as it will not fix the issue of the video cards back plate hitting the rear audio I/O connector shield.
OP's Photo of their rear I/O panel.
View attachment 294271
Asus did a bad job with this board (As did a few other manufactures with the 320/520 series boards.) and the audio connector placement. It is so low, you will have a hard time plugging in a mic and head set into it and will probably break the board 3.5mm jacks. This is what is causing your issue and the cost of a 16x PCIe with vertical video card mounting to fix it, you would be better off buying a new motherboard and transferring your parts to it.
You could force the video card into the x16 PCIe slot, but it will be bent on an angle and will probably start to give you issues if a few weeks as it pulls the slot connector from the board.
I would get a newer AM4 motherboard and swap your CPU and RAM over to it. Windows should still boot up but give an error message about the key already being used. So, you will have to get with Microsoft to allow you to reuse the key. In some cases, you might have to get windows to fix the install, in which case you should not lose any data, but some programs and games may not work and have to be reinstalled.
Look at something that might have the wireless built into it
Gigabyte B450M DS3H WIFI Micro ATX AM4 Motherboard (B450M DS3H WIFI) - PCPartPicker
On a side note, I would get another stick of ram the same size you have and run the memory in dual channel mode, as it will speed the system up and make your game run a bit faster.