is there another way to protect yourself from identity theft besides just checking your credit report? 5 pts!?

can i change my number if no one has used it or done anything to me yet? I want to be as safe as possible after someone has found out all my information including my ssn. from what i found online, only thing i can do is monitor my credit report. so does this mean i cannot do anything until damage has been done?
how long does a freeze cost? Will it cost me 4 dollars each month, or is it a onetime fee?

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