I watch a movie every Monday.
I know this sentence is in the present tense and it indicates something routinely done.
How could I say that in the past as I no longer watch movie.
My guess is:
In the past, I watched a movie every monday.
In the past, I was watching a movie every monday.
But the problem for me is that the past simple tense is to indicate a specific point or event that took place in the past, not to indicates a repeatedly or routinely actions in the past.
And the past continues is to indicate an action that runs in the background and requires another action in the past simple and this is not the case here.
I have learned that used to is correct here but this is informal, is that right? what are the alternatives here?