Ps4 fan too slow to cool down the ps4 (fan speed always low)

I have a launch module ps4 that i bought about 2 years ago. I didn't know much about it then but later on a realized it was making an excessive amount of noise after i compared to my friend's ps4, so i watched some YouTube tutorials, opened it up and cleaned it with compressed air (it was clogged with dust) replaced the thermal paste and the thermal pads and that fixed everything , but then after a few months it started overheating and shutting down without even displaying a warning and i noticed that the fan is not spinning fast enough (it never changes speed) The was always spinning at the Lowest speed and no matter what i play it never speeds up ( i tried playing red redemption 2 and it shuts down in minutes) so i replaced the fan with another original one from another same model ps4 and that fixed it for a few days , and now the same exact problem is back

PS: APU reball is not an option because there's no one in my country who can do it

Update:

Apparently the fan does change speed but it's barely noticable and doesn't really do much to cool down the APU