CPU Usage higher than usual

Apr 8, 2018
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Recently my CPU has been getting higher % usage than ever.
I remember getting stable FPS in CS;GO ,but now i get alot of frame drops.(when i bought this pc)
I started playing Fortnite,and i had more stable FPS on the launch of the Battle Royale mode,but now i feel like every time i move my mouse my fps drops below 60.
I think thats cpu defragmentation(i dont really know,i learned it from the internet)
Really need help from someone that understands these kinds of things
And btw. i noticed higher cpu usage than gpu,and i really didnt monitor the usages before.

My PC specs:
CPU-Amd athlon x4 750
GPU-Amd radeon r7 250
RAM-Ddr3 ram overclocked to 1833 Mhz

I was thinking about getting a new GPU,but i dont think that would fix the problem.
Then i thought about getting same CPU,in hopes of cpu defragmentation.
And then i thought about getting a new PSU,since mine isnt really that good and i read something about the similar problem,and a new PSU is the answer.
If you have an idea please comment it down below