Routine is very healthy for progress, and while it can take a while to get used to after a long break, it's absolutely one of the best things for practice. It needs to be guided by sound principles though, because the wrong kind of routine can actually be counter-productive. The way to ensure that the routine you're returning to is going to give you the results you want and the benefits of your work, it's good to have some kind of simple points of focus to maintain your work on the right course towards your objectives.
This is one of the sentences which I use a lot in the thinking skills project that I've been teaching in workshops, and one of the best ways in which routine should be guided:
"You live, the way you think"
Simple and straightforward, but then all the very best ideas often are. Think of this as you plan your routine, and you won't go far wrong.