Over time the OS will slow down..
If you have only 1 HDD and everything goes on that disk it will slow down, try scanning your HDD for errors too.
You would be better off getting an SSD for your OS only and keep the other drive for storage, so a 250gb would be large enough..
Definitely do a scan on your HDD, open a command prompt in Admin mode and run chkdsk..
AMD Ryzen 9 9900x, Asus Tuf Gaming RX 6700 XT, Asus Crosshair X870E Hero, 64gb Kingston DDR5 6000, Samsung 980pro 1tb NVME, Samsung 970 EVO Plus 1tb NVME, DeepCool Mystique 360 AIO, Antec Titanium 1000w.