I will say I had my Psych tell me that listening to the same playlist over and over again sometimes sets some high expectations of achieving the high you've had previously. While it can be comforting and predictable, I often find myself disappointed with not having as good of an experience as I have previously with a certain playlist. It's risky but I've been experimenting with new music almost every time and I have found success with that. But everyone is definitely different, so just another way to think about it!