Low CPU and GPU usage in game with 160 FPS max

hello, I have trouble getting high fps in game while my processor only go to 20% usage max and pretty much the same for my gpu...
is there a way to solve this or is this just a multi-threading issue ?
my specs are :
ryzen 7 5800H
RTX 3070 Laptop 100w
16GO ram 3200 Mhz
SSD storage
60° max on both GPU and CPU while playing, go to 80 in other games
mangage to go to >400 fps in fortnite
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