Any Zapier experts out there?

Hi there! I recently started using Zapier for automating my business, but I’m finding it lacking in solving one of my desired outcomes.

I wanted it to automate my crediting system for the service I provide. Basically, I want it to send a message on Slack when a condition is met on Google sheets, here’s the thing though, that condition is oddly specific, because the credits roll over for the next month if not used up. So even if everyone gets 10 credits each month, some will have (10)+1, (10)+3, (10)+9 and etc so I don’t know how I can specify it to send a Slack message when the credits increase by 10.

I hope this makes sense to anyone out there, thanks!
SEMrush