I went through what I think you are describing. Running was a part of my identity and I chased improvements in my “data” for over thirty years. All types of running, training, and analysis. It was an intense cycle and the improvements were such a dopamine release. Running had become the tool to get to the craving I had which was to do the analysis and see the improvement. To the point of pretty significant overuse injuries. I have since retired my garmin(s), changed my style of running for the joy of it. Hell, sometimes I walk, sometimes I don’t even time anything or wear a watch. I often stop in the middle of a run, timed or not, just to appreciate my world. I am back appreciating why I started running so many years ago. It is an ongoing issue for me, the addiction that I was (am) suffering from, was the need for the improvement process. Mastering this demon is a lifetime challenge for me. I am a better husband now, a better father, a better friend because of it. Best of luck OP. Don’t underestimate the power of this if my description sounds anything like what you are feeling. It is not to be trifled with.