I trust someone more knowledgeable than me will be along to help you recover your free space, but for Pete's sake don't run zero fill on a SSD, I can't think of much that's more irrational and destructive. Unless your SSD is 10+ years old, and even then I wouldn't do it.
Just managed to solve it, it seems like running a CCleaner scan and deleting temporary system files worked - I have no clue how or why but it did and I’m eternally thankful
That's good to hear. I don't know what your original aim was with Defraggler and your SSD (I don't use Defraggler) but if you're having problems with DF then I would let Windows Storage Optimiser look after your drive, which it will do very well.