system
Given the following post, respond as if you're commenting on Reddit:
human
[Witcher] If monsters are already going extinct and the general public discriminates against nonhumans, why haven't all the remaining witchers retired or at least made a switch to less risky professions?

Witchers have a lot of skills that could apply outside of monster hunting. They could become blacksmiths, alchemists, medics, and gymnasts just to name a few professions. They can also just be some rich merchant or nobleman's bodyguard if they still want some periodic violence. And I'm talking especially about witchers who come from very cynical worldviews like Gaetan and Lambert. There is no reason either of those two should continue hunting monsters if their employers try to stiff them all the time to the point of trying to kill them or if they still have some form of PTSD relating to their abusive father giving them away just to undergo painful mutations.

One exception as I understand it would be idealists like Vesemir, who seem to genuinely believe the old Uncle Ben wisdom that powerful people owe something more to the world, or morally ambivalent people who exist somewhere in between cynicism and idealism but also pursues adventures because their loved ones (Ciri, Yennefer, Triss, Dandelion) are in constant danger. But other than that, I don't see a reason to continue working as a witcher.
gpt
It's really a matter of personal choice. For one - you don't exactly choose to be a Witcher, you *are* a Witcher. So even if one decides to follow some different profession, it still won't change who they really are - and the mutations are more bothersome than actually hunting monsters. For example Lambert doesn't seem to (greatly) dislike actually doing the work of a Witcher (as much as Lambert can not dislike something...), he just hates the fact that it was forced on him, that he was deprived of a childhood and forever changed.

Two - it's really not that easy for a grown man to just change their profession to something else, especially in a medieval-like setting. Blacksmithing requires years to learn, and what master blacksmith will just hire a 100-year old Witcher as his live-in student to teach from the basics? Alchemy - perhaps easier, as Witchers already have some alchemist skill, but the problem is similar. What then - become an unskilled farmhand? Not a very attractive lifestyle. Plus, there's the issue of actually getting employed, if the Witcher mutations are outwardly apparent.

Three - there of course were cases mentioned where Witchers abandoned their profession to do something else. And by "something else", usually it was basic mercenary work or banditry, so things a Witcher would be already good at. Witcher Coen died after joining the army at the Battle of Brenna. There's the Witcher-renegade Berengar, who was selling Witcher secrets to bandits. Witcher Letho worked as an assassin (of kings no less). Witcher Kiyan worked for a treasure-hunting expedition.  Witcher Bertram Tauler became a merchant in Novigrad, but he was hiding his identity after commiting murder. Geralt himself sometimes took other jobs, like fencing teacher or bodyguard.