There are dependencies when it comes to establishing NAT types.
Before you do anything you need to do some reading and tailored research relevant to your network and gaming environment.
For starting purposes, just as examples and not necessarily solutions:
https://portforward.com/nat-types/
https://www.top10vpn.com/guides/how-to-change-your-nat-type/
https://support.activision.com/articles/port-forward-and-nat-faq
There are many similar links to be found.
Do your own online search starting with "what is strict nat type" or words/phrasing applicable to your network and gaming environment.
First, ensure that you fully understand your current configuration.
Second, identify potential changes or means to undo the Strict NAT setting and where that needs to be accomplished.
Third, make a change and only change one thing at a time. Keep notes on what you change, the original configuration, the new configuration, and where the change was made. Allow time between changes. Be prepared to go back and undo any given change if things go astray.
If you are unsure about what to do then post additional images of the applicable/appropriate router admin windows.
This router:
https://www.syntech.co.za/product/t...-x-lan-1-x-wan-4-x-antenna-1-x-usb2-0-router/
Correct?
Verify that I correctly identified the router. Go to the manufacturer's website and download the User Guide/Manual.
The User Guide should provide the necessary steps to configure NAT as required.
[Note: Do be careful about other sites offering the User Guide/Manual. A couple of sites triggered my AV protections]