PC performance is trash?

I'm sick and tired of this PC that I have. I thought i'd finally be able to play games to their full potential after spending over £800 on a decent PC, or so I thought it would be. Yes it does run games like Doom or ARK and can display maximum graphics on most games, however there hasn't been a day where I've been able to play without lag or packet loss especially in some games that host a lot of connections like mordhau (36v36 max players per server) I don't know why or what causes packet loss and I've never been given a straight answer, ever since I first encountered it a couple years ago. If you search up "how to fix packet loss" there is not a definitive answer and results are a bunch of hundred-page-long threads that go over different methods, none of which work.

On top of that I happen to be running out of data space and it seems that every external hard drive you can add onto your pc is ridiculously expensive and I don't know how to build it in. I really need some sort of explanation as to why my PC that is supposed to be built for gaming doesn't allow me to game. My PC experiences more crashes and huge lag spikes than pc's that are worth half as much with PC specs that are half as impressive. It makes no sense. Here are my pc specs:

Processor AMD Ryzen 5 1600X Six-Core Processor, 3600 Mhz, 6 Core(s), 12 Logical Processor

BaseBoard Manufacturer ASRock

BaseBoard Product A320M-DGS

Installed Physical Memory (RAM) 8.00 GB

BIOS Version/Date American Megatrends Inc. P4.40