You do, most SSD controllers already implement this. Have you ever wondered why most SSD's come in slightly odd sizes like 100GB instead of 128GB? The extra space is put aside and used for wear levelling and other maintenance tasks.

You can find out a bit more here https://www.seagate.com/gb/en/blog/ssd-over-provisioning-and...

I also remember a guide a while ago on how to reprogram a SSD to operate in SLC mode instead of MLC. You lost disk capacity but gained a large performance boost and a reduced error rate.