Predator Helios 300 PH317-51 - Why are my temperatures so high?

I have a Predator Helios 300 PH317-51 laptop. My temperatures are literally terrible. This is a picture of the PredatorSense temperature chart after around 15 mins of playing Apex Legends. It was the first time I've ever played it, so its graphics settings were pre-set to high. I manually set everything in the graphics tab to low (and overclocked the GPU as well, which is something I rarely do,) but as you can see, temperatures were still maddening. They went as high as 91C even though I maxed out the fans and had coolboost on.) I have an active undervolt of -0.140 and it seems like it's still of no use. A lot of things could be the cause of this problem, especially because I didn't have this problem until a few weeks ago. The laptop is around 8 months old, but I have been always using my baby very carefully and treating it how it wants to be treated, so I don't suppose it would be something like dust buildup or misuse. I don't think its thermal paste was misplaced, either. That's because, as I said, it used to handle temperatures pretty well until a few weeks ago, but now, even a normal chrome browsing experience with 2-4 tabs of light-moderate use makes the parts run at questionable temperatures. 50 - 53 as shown below. Even when I play Fortnite on Low, temperatures are still high.

The culprit that I suspect here is the OS itself, Windows. I've previously read a Reddit post on how severely Windows' version and build number affect temperatures, and then when I came to think about it, I remembered that I had upgraded my Windows build from 1803 to 1809 to enable having my file explorer background as black. I then said that I should revert it to 1803 and see if the build was actually what caused the temps to become noticeably higher even when idle. I felt a bit relieved about it because I recalled that the temps actually started increasing around the time I installed that new 1809 build so I thought that reverting it to the previous build would somewhat solve the problem, but that relief came to an end when I found out that I couldn't revert it anymore because more than 10 days have passed since the upgrade. No words could describe the desperateness I felt. I was hoping for the laptop to last me 4-5 years if I used it right, but turns out it's starting to give in real  quick. I now can't use my gaming laptop for gaming. I am truly saddened. If you could help me with my problem with anything, please let me know, and thanks in advance!