Looks like you are high octane rider. 
You are already approaching Elite status stars and your spider chart indicates you’re strong across the full range of focus durations and in the top percentile of Xert users.
It sounds like you were in full speed ahead, no pain/no gain mode of training last year.
Perhaps too much SST as well. 
The consensus here and elsewhere is you will not see year over year gains with that approach, nor higher peaks in season. You are more likely to plateau and require rest weeks to move forward.
Xert is a hybrid polarized platform. Many of the recommended workouts will probably seem tame to you.
Sweet Spot, Threshold and Polarized Training … By the Numbers – Xert (baronbiosys.com)
That workout is labeled (aerobic) endurance at 90% TP which should be taxing for 20 minutes x 3 but not something that is supposed to wipe you out. You shouldn’t have issues finishing it with your level of fitness and the goal isn’t to make harder.
Note your fitness signature is currently flagged as stale (no change in over 4 weeks). That means it’s good time to go for a breakthrough workout/ride to validate your numbers. Preferably when fresh. There are tips on doing that in this thread (it’s not a one-dimensional RAMP test):
Beginner questions - Support - Xert Community Forum (xertonline.com)