It seems a bit pointless arguing about whether the number of congregations is shrinking when we actually have those numbers available. From what I can remember there has been a small drop in the number of congregations over the past few years but it is a very small drop of around 1 or 2%, and in the latest report the figure is rising again. Some countries had a higher drop than all others, including Germany and the US. Britain is pretty flat.
Whatever way you look at it, the small drop, or stagnation in the number of JW congregations is nothing compared with mass closure of churches in western countries. Other denominations are talking about the need to close hundreds more congregations (around a third) in the next decade, on top of hundreds of closures that have already taken place.
https://www.bbc.com/news/uk-scotland-65645891
This article says churches are closing so quickly they are struggling to cope with the process while not to lose all the historical items and history inside these buildings as they are converted or demolished.
https://www.scotlandschurchestrust.org.uk/blog/recording-scotlands-closing-churches/