See: Here's How to Delete Files and Empty Trash in Gmail

On the other hand, there are a number of things that need to be considered too, namely after the item or file goes into the trash.   Then the file will be deleted automatically.

Selected items or files used as junk messages will be automatically deleted after 30 days.

It is necessary to empty the spam folder on a simple Gmail account on a regular basis.

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Because if you don't empty it, the data that goes into the spam folder will actually double the amount used on your Gmail account. (*)