870 qvo

I have an iMac 2017 using a Samsung 870 QVO 1TB SSD and its writing speed is very slow, only 14MB/s. I have been using it for 2 years, is there any way to fix it? I often use it for a long time so it happens like that, My hard drive has 700GB free space

UPDATE 3: Solved? seems like the 870 QVO sucks and there's nothing you can do about it, the write speeds will be limited to 80MB/s after the cache gets filled. I was noticing the extracting speed when using WinRAR was very slow, and decided to benchmark my SSD again to see if it's because of...

So I bought a Geek Squad Refurb 2TB 870 QVO. I've heard reports of people buying these with higher usage. I was told to install CrystalDiskInfo to see if the used numers are acceptible. I am not familiar with SMART and what these numbers mean so at first install I ran CrystalDIskInfo but...