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No tricks for this I'm afraid. As @Raynos pointed out, semicolons are optional. But if you want to learn the habit in case you might learn other languages that require them, just code slowly and remember it for each line. As you get used to the idea, you'll be able to code faster and it'll become a habit over time.
You'll only get it in the same way you got the habit of not placing any: by "writing a ton of the language".
In week #3 and language #3 of CS 103, Comparative Languages, our prof took questions about what problems we were having. Someone said that they couldn't remember which languages had semicolons as separators, and which as terminators. Prof said if you couldn't deal with that, you were gonna fail.