Hello shlebysog...hopefully I can give you a bit of helpful guidance given the information provided.
When talking about lag, I understand that as "the delay between the actions of a player and the reactions on the game server". This can have a variety of causes. Most commonly is high latency on your network connection, but it can be other things as well; the amount of available RAM, CPU utilization, GPU, etc.
Netflix and YouTube will have a couple tools that help alleviate the appearance of lag, namely buffering and auto-adjusting their streaming quality. Discord audio does not use a great deal of bandwidth while in a voice call.
There are some troubleshooting steps you can do to help narrow down and isolate what you are experiencing. This is a process of discovery and analysis...there is no 'check this one thing' and you're done.
Since you are using wireless for your connection point, my first suspect is that connection. You've used multiple wireless adapters, and with the same results I'd have to consider environment (distance from access point (AP), wifi signal saturation, physical interference: walls/filing cabinets, other devices in use on the network, etc..). First thing I'd do is try and determine if this was wireless related or not by hard-wiring to the network with a network cable, disabling the wifi connection. If the problem goes away entirely, then you know it has some thing to do with wifi. If not, you could still be looking at a network issue in the form of local bandwidth availability (other devices, etc..) an ISP issue, or something specific to your PC.
There are a number of settings in games that can impact performance and relate to the hardware you have. Another thing you can do is look up the recommended game settings and compare that to the make/model of your computer...most importantly focusing on memory (RAM), CPU, and graphics. You may need to adjust the in-game settings to be lower in order to accommodate PC capability.
Another thing you can look for is other applications running at the same time or in the background consuming system resources. For instance...if you have a Chrome web browser open with 50 tabs while you're trying to play your game, available memory may be an issue. Or perhaps your CPU is being used by other processes causing a processing bottleneck.
It takes some work to narrow down and determine what you have going on...I hope some of this has been helpful to you. Good luck!