If you currently use ToDoist for your task management, I would make tasks there and just watch the calendar within the Proton Calendar. Their recurring feature is very helpful and I already use the app for ToDos, so it's a win-win. If you have some tasks that go on forever, it is very easy to create tasks. For me, I currently have street cleaning reminders. Hope this helps!
If you currently use ToDoist for your task management, I would make tasks there and just watch the calendar within the Proton Calendar. Their recurring feature is very helpful and I already use the app for ToDos, so it's a win-win. If you have some tasks that go on forever, it is very easy to create tasks. For me, I currently have street cleaning reminders. Hope this helps!