That is your outdoor free ride advice if you decide not to select a structured workout to ride indoors or outdoors.
In this case ride very slow and easy (2:00 hour endurance focus*) with irregular intervals at around 234 watts. Or take a rest day since you have a surplus.
See this thread for details – Xata free ride recommendation - General - Xert Community Forum (xertonline.com)
*IRL you can’t ride that slow outdoors unless you happen to live on salt flats 
, but you can keep focus in the 20+ minute range (endurance) if you are diligent about starting out slow and avoiding all surges and steep grades.