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This article describes how you can get your steam key:

https://jni.itch.io/ancient-warfare-3/devlog/18776/steam-release-update-15

This is the itch.io article about how purchases work:

https://itch.io/docs/buying/already-bought

Your email is unrelevant, because you have to connect your steam account to your itch.io account to get the key.

Ohhhhhh how do I connect the itch account to the steam one? I think ill lose ALL of my games that have been purchased or will they still be there?

No, you won't loose your steam account purchases.

All you need to know should be explained in the official itch.io documentation: https://itch.io/docs/buying/already-bought

Just click on the get steam key button and follow the instructions.