From what I can tell but I maybe wrong that device only comes as a M.2 card. This card could either be on your motherboard or be on a PCIE card that uses a adapter to convert the m.2 connector to a normal PCIE connector.
In both cases they use short wires to connect between the card and the antenna on the back.
So I would first look at the small antenna wires that connect to the wifi chip. These are extremely tiny. Mostly you are trying to see if they are loose or got detached. Do not pull on them but you should be able to tell if they are not connected. These connectors snap in place but are extremely tiny so it is hard if you have bigger hands.
I would still try replacing the external antenna first. These should screw on fairly firmly but they are designed to swivel.
So if none of this works you have a different option that getting a new PCIE card. If this wifi chip which uses what is called a M.2 connector is on your motherboard you should be able to remove it and replace it with another wifi card. If it is on a PCIE card rather than your motherboard you can replace just the M.2 but it tends to be simpler and about the same cost to just buy a new PCIE card already setup.
These are 2 examples of what I would replace it with. This is a newest intel chip using ax210 but they cost about the same as older technology.
These are purely example I found to show you want they look like, you need to do your own research as to if these are really a good option.
https://www.amazon.com/AX210NGW-Supports-Tri-Band-Antennas-Low-Profile/dp/B088NHCX46
This is a pcie card and unlike many of these you can actually see the m2 card that is mounted and the antenna connector. Many this is all covered. Again this is just a example for you to see what things look like and compare it to your current
https://www.amazon.com/dp/B07X462KRK