The ranking system must’ve gotten worse lol

So I made it to diamond and went from D1 to D3 in one day and then from there on out my percentage in diamond 3 never went up and yesterday I was deranked to diamond 2 and I literally haven’t lost any games nor do I go negative in any matches so I’m trying to figure out how does it make sense to derank me when I win my games and have a K/D average of like 15-3 every game. It wasn’t like this in any other season. If you win you gain, if you lose you lose, it should be based on performance to determine how much you gain or lose.