Automatically change client status to Inactive?

[Iki]

Hi, I prefer using WHMCS for selling my digital marketing services, not web hosting or domains. I have 2 licences currently with 250 active clients limit. I have both one time payment products and monthly subscriptions. Usually customers who purchase one-time payment product do it once and majority don't purchase again. WHMCS count these clients who order once as active and my number increases fast, then I have to manually change statuses/delete clients from Admin area. I would like to set automatic status change to Inactive client if client didn't order any new product within 30 Days for example. This should not apply to clients who subscribe for services as their payments automatically renew. Is such thing possible to do? Or is there anything else you would advice to do in this case? Thanks