i need help with my account

maybe a year ago my friend gets in my account and change my username, password, and email I made him give me my acc back but he didn't change email, I think he can steal it again, I feel scared for my account and I need anyone that can help the guy that steals my acc, I played with him for some time and we talked with discord, I know what kind of person he is, I don't wanna lose all my friends and the levels I get
[sg-janna] I don't know is this place where I post this kind of thing but I need fast help