You can put it in a custom case. Releasing the space constraints enforced by a laptop design means you can easily have a better cooling arrangement so experience less thermal throttling if you ask it to perform longer compute-heavy tasks.
If you are building custom cases for laptop boards, just buy an old tiny PC at that point. They are like $50-100 on eBay if you don't need killer specs. Unless you're just doing it for the love of the game or happen to have a lot of laptop boards sitting around you can sell, it's not worth it.
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