Cat 8 keystones are shielded to prevent interference from external sources, but they also require proper grounding to avoid interference from within the cable. Wrapping the end connections with copper tape before terminating them is one way to ensure a good ground connection and reduce interference. Using passthrough modular crimping plugs, connecting the RX/TX wires to different pins, or running a speed test on a slow device are not relevant or effective steps to troubleshoot the issue.
Reference:
CompTIA Network+ N10-008 Certification Study Guide, page 191
CompTIA Network+ N10-008 Cert Guide, Deluxe Edition, page 362
CAT8 RJ45 Keystone Problem : r/HomeNetworking2
How to Terminate Cat8 Shielded Keystone Jacks3

Traps are a mechanism for network devices to send unsolicited notifications of events or alarms to a management system. They can be configured to notify the network management team of specific events, such as the unplugging of a point-to-point link on a core router. This feature allows early detection and possible resolution of issues.
MIB (Management Information Base) is a database of information that describes the management data of a device. OID (Object Identifier) is a unique identifier used to identify managed objects in the MIB.
Baselines are a standard set of measurements used to establish normal network behavior, and they are used to compare current network activity against. Baselines can be used to detect abnormal behavior, but they are not as effective as traps for early detection of specific events.

Pinging the default gateway and DNS server of the workstation is an example of breaking the problem down into smaller, more manageable parts. This is a bottom-up approach, which is a common troubleshooting methodology.