Sorry, was just confused whether it was sarcasm or not, wanted to make sure.
But OP, I too would recommend reinstalling Windows, however make sure anything you don't want to lose is backed up, either on something like OneDrive, a USB stick, whatever you prefer. Often it's automatically saved to OneDrive so as long as you know how to access that, you'll be all fine to get your important documents back, etc. I made that mistake with my PC, lost everything
I personally wouldn't recommend opening up the laptop itself and replacing parts, I wouldn't even trust myself to do that
But just a precaution, have you been doing regular Antivirus checks to ensure your device is free of viruses, malware, etc.? These can often be the culprit of slowing the laptop.
And on the other hand, from my experience with this same laptop, mine was pre-installed with McAfee, which over time for some reason rendered the laptop pretty much unusable (which I've seen is common online with McAfee), so if your laptop came with this pre-installed, it may be worth looking into unistalling that and seeing if that changes anything. (Of course, installing a new Antivirus afterwards
)