same problem in China, usually the biggest available shoe size is 44, it improved a bit, but it's still lottery, I usually buy 46 in Europe, I was this summer in China, bought relatively cheap shoes online knowing it will be lottery and result didn't surprised me: 46 size shoes I received were more like 44-45 47 size shoes were actually like 47

in the end I have one pair of shoes which is fairly tight and other pair which is very loose, but got used to that, easier than tight one

and I tried to read reviews where people describe how accurate are the sizes for sizes in XL, I am quite skinny and very tall so I end up with something like 3 or 4XL to get ordinary size

btw. wife got used to European sizing where she buys XS or S size and she had very bad surprise after shopping in China where she found out she is now by Chinese sizes considered more like M or L since those XS and S Chinese sizes are pretty much for small girls :-))