Continuous 144 fps in fortnite?

I have in Fortnite if I set to unlimited about 165-230fps because I have a 144hz monitor, I have limited my maximum fps to 144 but then instead of 144fps I only had 120-135fps but why?

Then you need more power.

But my graphics card does 165-230fps?

Can you please write what kind of CPU and GPU you have and what settings you play with?

AMD Ryzen 3 2200 and I play low unless the render distance is epic

And GPU?

Or don't you have one since it's an APU?

Gforce GTX 1070

And is it not the cheapest 4 kernel from AMD (sry if it is wrong)

A question: who configured it?

second question: why did you say a PC to a PC with a 4 cores in 2020?

third question: what do you need the maximum of 24 frames for?

I do not understand so much about pc's, so I ask also I said I have a 144hz monitor and because of that I wanted to limit to 144 fps but then I had less fps even though my PC had 165-230fps