system
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human
[Star Wars] What exactly did the Republic think they were going to do with the clones after they won the war?

Seriously, how many were active by the end of the Clone Wars? A million or more?  What were they gonna do with that many clones *that were bred for war and nothing else*? Yeah, a million isn't a lot compared to the population of the galaxy (you could probably drop them all off on Coruscant and be done with it). However, what if they all had a crisis of identity? After all if they were soldiers and nothing else then that would mean they wouldn't know what to do with themselves, not to mention PTSD and the like. Did the Republic even have a veteran's program? It's the same problem in the Warhammer universe: what do you do with a million or more super-soldiers after a war, super-soldiers who know essentially nothing else, but war and violence (Good thing war never ends there) ? Basically, would they have liquidized them or done something else?
gpt
Honestly speaking, they likely had the "we'll cross that bridge when it comes to it" mentality, after all the Clones were seen as a necessity during the war, so much so that despite the obviously suspicious nature of a former Jedi turned Sith ordering their creation in the first place they still used and trusted them.

It's also important to remember that the clones aged exceptionally fast, for obvious reasons, but if we use Captain Rex as an example, he's 5 years younger than Ahsoka yet by the Star Wars Rebels series he's already old enough to look like her father.

I believe some of the older troops towards the end of the wars were relegated to emergency services and other jobs of need and the end game plan would likely have been using a small number of them as a standing army and the rest would become farmers/workers to aid Republic supported planets.

In the grand scheme of things, it's a short term problem and most soldiers would have made the transition into emergency, labour and security services quite comfortably.

TL;DR - No plan, likely spread throughout planets until they die at an accelerated rate.