I've been using this Raspberry Pi kit strictly for running Pi-Hole on my network since April of 2021. Vilros Raspberry Pi 4 2GB Complete Kit with Clear Transparent Fan Cooled Case
Lately, the fan has become VERY noisy. To me it seems like this Pi is near its end of its life. Should I replace the fan or would it best to buy a new Raspberry Pi kit and start from scratch?

Any feedback would be appreciated. Thank you!