Try me. I've already read all of the ones I can find - they all say the same thing - masks have a barely positive impact (non-zero, but barely positive) on the transmission of Covid. This is not surprising, as the holes in a mask are significantly bigger than the aerosols that they are supposed to slow.

Many different measures have been implemented, you can't possibly pick one of them and say that particular one has had a definite impact on a certain thing.

At least where I live, the way that Covid deaths were recorded over the winter left plenty of leeway for those dying "with Covid" to have just died of the flu (to be specific, if a patient had symptoms or evidence of a viral respiratory disease being the cause of death, then all that was needed was a "clinical picture of Covid" to make it a Covid death).