I seem to have thoroughly confused Google with regard to my region/language/currency preferences. Youtube regularly shows me videos in German, Google Maps keeps

I seem to have thoroughly confused Google with regard to my region/language/currency preferences. Youtube regularly shows me videos in German, Google Maps keeps reverting to UAE dirhams for the currency it shows prices in, and Google Search always opens in Chinese. I use Google products in a Firefox container which is always logged in to my Google account, which should contain enough information for them to understand that I read English best and would prefer prices to be shown in Euros (or any of a list of maybe 10 other currencies before I would consider dirhams), but there you go.