Parsing emails to create/update Active-campaign list

I think I am making this much harder than it needs to be, so hoping someone can help me. 

I have a podcast on Buzzsprout, in which people can choose to pay a monthly subscription.

When they join I receive an email to GMAIL giving me their details. I also get an email when they cancel. From here, I want to 

1. add them to a mailing list in ActiveCampaign
2. tag them as ACTIVE in order to automatically send them a welcome email in Active-campaign

Then when they end their subscription, I want to

1. remove the ACTIVE TAG

HOW do I do this?  So far I have tried to set up a filter and automatic forwarding of the emails from gmail to Email Parse by Zapier (this didn’t work first time so I created a zap to forward these emails). 

Then I created zap 2 to send the Parsed info into a new row on my Google sheet.

Then I created zap 3 to create/update activecampaign contact when new Google sheet row is added

where I also add the tag.

This is where I am hitting a wall.  I am not sure how to separate New Subscribers from Cancelled Subscribers.  I can parse that info and add it in a “Status” column in the Google sheet.   

I hope I have explained this clearly enough for someone to help clarify what I should be doing.  Do I need so many different zaps? Do I need a Google doc? Can I do a branching scenario in a zap (if this then that and if that do this instead)?

Thanks in advance. 

​​​​​​​BTW I am a beginner :S