
Hello,
I am sorry but the description is a bit unclear.
After you deleted unwanted files, did you manage to get it under 5GB total, but it kept growing out of 5GB again, or you didn't manage to get it under 5GB?
Can you go to your Microsoft account online via https://account.live.com
Scroll down and click on Microsoft Storage, take a screenshot of that section please and share here if you don't mind.