Net Jitter when gaming

I've been playing counter strike for about 10 years and for the first time im facing the problem where even when I have low ping i'm lagging all over the place because my net jitter keeps bouncing from 10ms to 60ms to 90ms and all over the place.

I have tried a few fixes like allowing cs2 through the firewall and reinstalling my network adapter. I even went out and bought an external wifi adapter, a Wireless AX1800 WiFi 6 USB 3.0 Adapter (A7500) and that fixed it completely for like 2 weeks but my issues came right back.

I'm not sure what to do anymore, any help would be much appreciated, here's the specs for my computer:

Processor: AMD Ryzen 5 5600G with Radeon Graphics (3.90 GHz)

Graphics Card: NVIDIA GeForce GTX 1660 SUPER (6 GB)

8GBs of RAM (7.59 Usable)