Newbie Looking to Upgrade Older Desktop

Hi there!

I am looking for some advice on upgrading my older desktop PC so it is capable of handling games and streaming. I have recently purchased an Xbox Series X so am not not too concerned with having the next gen available on this PC, more just having it capable of smoothly running a variety of PC games at a good level of performance.

I am pretty new to all this so any advice on upgrading the below specs would be much appreciated, as I am near clueless as to what I should be upgrading to. I understand it would be the graphics card, RAM and power supply (do shout if I am missing anything here) but as I have searched more on this I seem to be greeted with information overload for many PCs so would be nice to get some specific advice on my system.

Tech Support Guy System Info Utility version 1.0.0.9
OS Version: Microsoft Windows 10 Pro, 64 bit, Build 19042, Installed 20210303235526.000000+000
Processor: Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz, Intel64 Family 6 Model 60 Stepping 3, CPU Count: 8
Total Physical RAM: 8 GB
Graphics Card: AMD FirePro V3900 (ATI FireGL), 1024 MB
Hard Drives: C: 618 GB (392 GB Free); D: 300 GB (299 GB Free);
Motherboard: FUJITSU D3227-A1, ver S26361-D3227-A1, s/n B24BF432
System: FUJITSU // American Megatrends Inc., ver FUJ - 1072009, s/n YLNF031221
Antivirus: Avast Premium Security, Enabled

Thanks