I'd say you're off to a great start, however my first instinct is to make sure the call activity data you're looking at is up until the point they became a Marketing Qualified Lead. To do this, you could utilize the native date stamp fields that HubSpot has for each Lifecycle stage:
Became a subscriber date
Became a lead date
Became a marketing qualified lead date
Became a sales qualified lead date
Became an opportunity date
Became a customer
Became an evangelist date
That way you can view your Marketing Qualified Leads for a given time period, and then monitor call activity volumes to those folks during the months they started off as a Subscriber or a Lead leading up to the point when they became a Marketing Qualified Lead. That may help tell a more accurate story.
Let me know if this helps or if you have any further questions!
I'd say you're off to a great start, however my first instinct is to make sure the call activity data you're looking at is up until the point they became a Marketing Qualified Lead. To do this, you could utilize the native date stamp fields that HubSpot has for each Lifecycle stage:
Became a subscriber date
Became a lead date
Became a marketing qualified lead date
Became a sales qualified lead date
Became an opportunity date
Became a customer
Became an evangelist date
That way you can view your Marketing Qualified Leads for a given time period, and then monitor call activity volumes to those folks during the months they started off as a Subscriber or a Lead leading up to the point when they became a Marketing Qualified Lead. That may help tell a more accurate story.
Let me know if this helps or if you have any further questions!