If you are analyzing speed with respect to time, then you are decelerating.
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The object is accelerating
An upward sloping straight line indicates that the object being studied is moving away from the origin and that the component of its velocity in the radial direction is a constant. A downward sloping line indicates it is moving towards the origin. However, neither line says anything about the transverse component of its motion.
The horizontal line represents that the acceleration is zero or constant speed and the line that slopes downward means that the object is slowing down and it is a negative acceleration.
This means your velocity is decreasing with time, or in other words, the object is slowing down.
That the object being studied is accelerating in the radial direction.