Help with Vapi.ai/Gsheets outbound system

Hello, I need help with an outbound automation I am working on. The scenario is supposed to run through a list of numbers on gsheet, call each one, export dta to sheet and call next. but instead, it spirals. I need help improvin this so that it does not break and waste credits/scenarios. also, i want to make it more efficent in terms of cost. Wasting less credits. Vapi.ai, make.com and telnyx/twillio are being used.