Question - iCloud Storage

We recently got back from vacation, and now my iPhone keeps giving me this message. Not enough storage space to back up your iPhone. I have tried deleting a lot of pictures. That did not help. While we were on vacation, I did have to change my log in to the hotel password, but when I look at my settings, it looks like it’s set back to my home. I don’t want to pay money every month for iCloud storage. I would like to just keep the free 5 GB. Why did my phone suddenly start sending me this storage message?
— Susan L.

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