Gaming Optimization query

I’ve a Nord n20 5g and it's respectable at enjoying video games however i regardless moderately I play on minimal settings (minimal graphics) 60FPS in-game like cell legends or area breakout I discover what causes my gaming points is that my CPU persentage fluctuate (and I do imply fluctuate, in not like a gentle climb) from low 40% and jumps to 99% and jumps again all the way down to 40%. Are there any apps or developer settings or updates or any ideas to assist this concern?

Issues I've tried: on my developer settings I've restricted background apps to don't preserve actions.

I play on 35% display brightness.

I run a transportable fan to maintain my telephone temp at a gentle 38°C

I'm my sport focus mode/hyper increase I exploit professional gamer mode.

To this point with all these settings my CPU nonetheless sputtering and makes my sport really feel like I'm enjoying on 25fps.