Hi everyone, 

I'm new to the forums and wanted some help upgrading my rig. It's been a few years since I got my PC and I've noticed it starting to dip in performance with the latest games and just in general.

I have always purchased premade desktops but this time I want to upgrade because I think I've still got a decent setup, it just needs fine-tuning. 

Currently my specs are:

Nvida Geforce GTX 970
256SSD
1TB HDD
8GB Ram
Intel Core i7-4790 CPU @ 3.60Ghz
Liquid Cooling
Windows10 64

My SSD is full which is why I think I'm noticing some lag/increased loading times in general, browsing files, etc.
I also am a person that loves multiple tabs, I never close anything. I work from home and am also a gamer so I will leave tabs open on everything so that I can come back to them later quickly. 
I'll have multiple excel sheets up for work aswell as be watching a stream from Netflix/Twitch on my second monitor. I have tried to cut these habits, but it's in my bones and so I know I'll never change. 

How do I go about upgrading my system to handle my habits and not get slowed down?

My intial thoughts would be to double up my ram and install another SSD that is solely for my OS, then run frequently used software on my second SSD and use the 1tb HDD for storage. Is this possible?

I'm no expert is pc hardware, so any opinions would be much appreciated. Feel free to ask more questions if you think you can help!

Cheers,