Battery Dying Quickly

If it was at 100% at 6:30 AM there is clearly a problem. First, check battery health. If it says that it is normal try:

• Go to Settings/Battery and see which app is using the most energy, and kill it→Close an app on your iPhone or iPod touch - Apple Support
• Restart the phone→Restart your iPhone - Apple Support
• See the link posted by Tesserax

Can you define quickly? If you charge the phone overnight, every night, how long does it last during the day?

If you go to Settings/Battery/Battery Health what does it say about battery condition?

Not a lot of information in your post, so see if the following article can help:

• iOS 14 Draining Your iPhone Battery Life? 13 Ways to Save Battery on Your iPhone - iPhoneLife