I haven't played hotel harem for a long time, it might fail
The first thing you have to do is look for the save file from the harem hotel game, usually it is located in a file called "Harem_Hotel"
Second, after opening the file, you will immediately see a file called "saves". If you see it, copy the file and place it wherever you like.
Third, if you have downloaded the update, you can immediately overwrite the old file, but if you are afraid something will be damaged, you can delete the old file first and then extract the update file.
Fourth, if you play from Joiplay, then re-create the apk from within Joiplay. Before you re-create the apk in Joiplay, first copy the file called "saves" into the file you extracted earlier.
If it fails you can ask me I will help you as best I can