I feel like the matchmaking is rather broken, both for killers and survivors. I always thought that ever since the implementation of the new pip system a few months ago, both sides have it incredibly difficult to rank up and you're being punished for playing games too well (escaping quickly or killing all survivors quickly). I feel as if the system is incredibly counter-productive.
I especially noticed as much when I watched this video which I feel sums up the issues with the new pip system: https://www.youtube.com/watch?v=uJeliQvh8dU
In short, it was a long game with many chases, unhooks and so on, got 3 kills and it wasn't even a pip. Same can be applied to the survivor side.
I suggest the devs should either rework the current pip system (someone once made the suggestion to bring the first pip closer to the safety pip, for example, as a temporary band aid), or bring back the old system.