In general - do MAke has such kind of options of starting one flow when another is ended ? not only by schedule.
Yes, you can use Webhooks for this. Or, If you are in a higher plan you can use the On Demand schedule that can be triggered via Make App in Make.com.
Basically what you want to do is,
- In the first scenario when everything has been completed, Use Make an HTTP request, or if on a higher plan use(Make app) that can trigger another scenario
- In the second scenario, Have Webhooks as the first Module, Copy the URL from the Webhook module that you can use in Step 1 to Make an HTTP request.\