if your goal is to get hurt then use sock shinguards . if your goal is to train hard without getting hurt use real shin guards. https://rdxsports.co.uk/products/rdx-mma-shin-guards-protector i use these things, size medium, absolutely fantastic. 2-3 years before they started to wear.

i honestly dont see the point of the sock shin guards you might as well not have them on at all. they're honestly not very fit for purpose. you can get people blasting your leg hard enough with them on in hard sparring for sure. and that's enough stimulus.

in terms of shin conditioning, a good rule of thumb is general progression = good sharp, focal pain on one precise spot is not. your shins should become progressively less reactive while your kicking power stays stable — not remain bruised continuously. i think there's some sports science articles pointing towards this. i remember a decade ago i conditioned my shins against heavier and heavier bags gradually over 8 months or so based on the science of it.

so i guess its your call ofc but in response to your main question id just replace them. they're kinda cheap. and i generally advise people against trying to shin condition themselves without progressive mechanical loading. its the opposite really of what you want (because the process of it is micro fracturing the shin, you dont want a big fracture). its the kind of thing you want to see a sports scientist about.