Request for Hardware Update Advise for Beginner


I’d like to get into 3D animation, but I don’t know if my PC could handle it. Here are my specs:
447GB (43.6 GB available)
GeForce GTX 960
Driver version 398.11
Intel® Core™ i5-4690K CPU @ 3.50GHz

I’ve been thinking of updating some parts of my rig, but I’ve never done anything like this before since I first put it together (4-ish years ago.) I don’t really know where to start.

I was thinking of updating my OS since I’m wasting ram (24.0 GB (16.0 GB usable)) because my version of microsoft (Windows 7 Home) apparently does not support that much. Which Windows would you recommend if I decide to go that route? Is it even worth updating Windows to access unused ram?

I’d like a new video card, but I’m running out of space and I don’t really have proper backups. Would you suggest I invest in more hard drives for backups and such before replacing hardware or even updating windows?