Is this a legit iCloud email? They addressed me by my full name.

If Apple needs to contact you about storage, they'll do it through your actual account settingsΓÇönot by pestering you with emails claiming an emergency when your records show you've barely used half your allowance. These scammers are counting on you panicking and clicking their link before you think it through.

Stop and think before you act. If something feels urgent, threatening, or too good to be true ΓÇö that urgency is the weapon. Scammers use pressure to override your judgement. Nothing is ever so urgent that you can't take five minutes to check, call back on a number you found yourself, or ask someone you trust.