Am I doomed to always live between extremes?

So every december I take some time to reflect about what happened this year and how it has been for me. This year I realized that I didn't like this year at all. There were fun times, yes, but I feel like it has just been mellow in general. No devastating downs, no euphoric highs, just everything in between. And that's where I realized I probably have a problem, because to most people that probably sounds like a pretty good year. But I just feel underwhelmed, like it had no meaning. When I look back at my best years they were always filled with loads of times where I was feeling down and loads of times where I felt like they were the best moments of my life. And although when counting the days I probably spent more days sad in those, than in this year, I was still a way happier person overall. & now I'm wondering if anyone here has felt this way too and what you decided to do about it. Do you think it is something that can or even has to be changed? Or should I learn to embrace those extremes?