DJI Active Track will always be limited by line of sight issues and fast direction changes of the target. This has been rehashed many times over on this forum from day one. Forget all the latest Active Track improvements, or things like contrasting clothing, etc, it’s still pretty crude.
If you want to really upgrade your MP (or Air or Phantom) “follow-me” capabilities:
1. get a copy of Autopilot
2. Make sure your controller device is IOS with a fast chip and built in barometer (IPhone 7, 8, or X). Required by Autopilot
3. Get a small weather/impact resistant case (Nanuk 904 or equivalent), to stuff your controller/iPhone into while riding. It won’t be phone size small, but it will be small enough to work and still withstand some rough use.
4. Train/practice. Autopilot has a higher learning curve than the Go app or Litchi, but it’s not that bad
It really does work, and until DJI comes up with something better than object recognition based tracking software (notwithstanding the Skydio approach) nothing currently beats a barometer compensating gps based electronic leash.