Internet Data Usage History, What is causing my data usage to increase month to month?

Internet Data Usage History, What is causing my data usage to increase month to month? I am using the same devices and similar average time on TV and computer use? I went to Xfinity Branch, I was immediately told to add Unlimited Data for $30/mo.

Oct 2024: 916GB

Nov 2024: 1.29TB

Dec 2024: 1.86TB (Highest Data Usage)

Jan 2025: 1.28TB

Feb 2025: 1.15TB

Mar 2025: 1.26TB