Retention card - trying to get all employees when filtering by a few months

I'm creating a retention card. Date range is currently set for all time filtering by hire date. When I shorten the date range to 3 or 6 months, I lose everyone who has been hired before the last 3 or 6 months, which makes my numbers inaccurate. If I filter by termination date, I only receive data if the date range is set to all time. I have created a beastmode to include everything who was hired from when the first person was hire to when the last person was hired but that doesn’t seem to help.

Is there a way to include all time data even when filtering down to just 3 or 6 months?

Beastmode used to keep everyone included was

(CASE WHEN `hireDate` < 20300101 AND `hireDate` > 20140101 THEN 'TRUE' ELSE  'FALSE' END)