Are there any Garena RoV customer service reps here?

Why is it that once I reach Diamond rank, the enemies I encounter are so strong? Every time I log in and start a match, the beginning (first two or three games) is good, but afterwards it gets really tough, almost always because the opponents are too strong... If there are any Arena of Valor customer service reps here, please pay attention to the voices of fellow players who play Arena of Valor. Thank you.