If you're using the incremental query you shouldn't need to include the older subscriptions part of the filter once you've run it the first time. I'll describe how to create your 7 days ago filter and you can expand this as required.
Assuming you started by selecting Shortcuts > Subscription menu, then dragged Subscriptions onto the filtering canvas and selected your service from there...
You can add another filtering criteria and use Advanced mode as follows:

For copy+paste purposes: DateOnly(@created)=DateOnly(SubDays(GetDate(),7))
Or you could use: DateOnly(@created)=DateOnly(DaysAgo(7)) and get the same result.
Note that the created date and GetDate() are both datetime fields, so I've had to use the DateOnly function.
My final incremental query looks like this:

You can save this filter to make it easier for other users of the platform.