to send opened-contacts monthly in Zoho Campaign

to send opened-contacts monthly in Zoho Campaign

Hello,

I'm trying to test how we can send opened contacts monthly in the Zoho campaign.
As far as I know, we can use a chained campaign based on the recipient's activities. 

Here is the thing 
1) we will first send the campaign_A 
2) for every contact which has opened the campaign_A will be sent again next month_campaign B
3) every time they opened the campaign, we want to send them based on it monthly.

If we are going to use a regular campaign, I think we will need to prepare a manual and I'm afraid it will cause a lot of manual workloads.

Please let me know if you have a better idea or suggestions based on what I mentioned above.