There are no “routines“ in the new V3 app. They have been changed to a combination of “scenes“ and “automations.“
It sounds like your previous routine may have been changed into a scene, but you need some of the features that are only available in automations.
Try clicking on the + in the upper right and choosing “automation“ and see if you can do what you want there.
Also, just because you might have some additional questions, here’s the community FAQ on scenes and automations.