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Many ways to do this.

If you’re wanting to do it quarterly then you’d have to know how many were in 3 months so you’d have have a field for approved date for when they were approved. A date for when they were approved guests and date of the trips.

You need to do a Search for all hosts with the constraint approved = yes, and then :filtered Date approved > current date and time: format to months : -3 <_ current date and time:count

Do the same for guests and completed trips.

Or if you want to keep a log of it, so you can go back through it, create a log datatype and a backend workflow to action every 3 months to total the approved guests, approved hosts and completed trips. Basically do the formula above in the backend API every 3 months