Someone try to log in to my account from different cities in china

i came from china few days ago and since i got to my country “UAE” I keep getting a notification saying that someone from different cities in china , who wasn’t me, tried to log in to my Apple id. Luckily, I changed my password and logged out of any other devices. The next day I got so many notification saying that someone trying to log in to my account and from different cites in china and of course I clicked don’t allow and im still getting this notifications . I just want to make sure I don’t get any notifications like this again because it’s creeping me out. I want to make sure my account is secure.