Question Frame drops in game

Jul 22, 2020
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So a few days ago I upgraded my GPU to have better fps and less frame drops, but my fps still sometimes keep dropping to 60 and less (in fortnite). I already tried to fix it with a lot of things but nothing helps. That's why I'm going to upgrade something in my pc but I don't know what to have less frame drops.
Maybe does someone know what I should upgrade in my pc or/and know any solutions to fix the frame drops.

These are my specs:
Motherboard: Asus z170 pro gaming
GPU: Gigabyte rtx 2060 D6 6GB
CPU: Core I5-6600 (non-k)
PSU: Cooler Master G650M
16 GB ram (2 x 8 GB)
500 GB SSD

The temps of my gpu and cpu are both very normal. CPU ussage is almost always 100% while playing games like fortnite.