Welcome to the community and thanks for posting.
SmartThings deprecated routines in favor of scenes. The API being used doesn’t provide access to scenes directly, but you can use a virtual switch or simulated switch to trigger scenes:
I’m not sure I follow the question about modes. There is a Modes section within the app, Tasker plugins, and widgets.
Edit: be sure to take a look at sharptools.io as well. If you don’t have a specific dependency on something from your phone (eg. via Tasker), automations in the SharpTools.io Rule Engine might be a better fit.