[Solved] Why do the reccurrent donations by card of my visitors fail since January 2020?

Revolucion for Monica Asks: Why do the reccurrent donations by card of my visitors fail since January 2020?
I am taking care of a donation-based website and this is the graph of how much people subscribing for a recurring donation with their credit card (CB). As you can see there has been a sharp fall since the end of 2019 and I am wondering why:

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I thought it must have been 3D Secure protocol but according to this newspaper:

Strong authentication is already mandatory for online payments of €2,000 or more since October 1, 2020, €1,000 since January 5, 2021, €500 since February 15, 2021, €250 since March 15, 2021 and €100 since April 15, 2021.

As one can see it the drop started in December 2019, so its before 3D Secure implementation. But maybe these information are not related are we my problem deals with recurrent donations, so maybe 3D Secure was implemented before for this kind of transactions.

My other idea is that its related with the volume. But first, the drop started even with low payments and second, as one can see between March and September 2020 and December 2020 and February 2021 there were low initializations and the successfulness of recurrent payments was super low as well.

If you want to have a look at the donation webpage here it is.

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