It does sound like you maybe need to do a test to try & achieve a breakthrough, or something like a Zwift race, if you use Zwift?
I did a fitness test workout at the end of last week - Fitness Test for Breakthrough version 2.
One thing I would say is that the sprint intervals are very short - on the one I did they were only 7 seconds & my legs and the trainer were really only just getting up to a decent power before the interval was over & the resistance dropped off.
I would consider doing those sprint sections in slope mode & perhaps hanging on for a bit longer than the 10s interval length to get the most effort out of your legs.
There’s some good info here:
My result is in there at the bottom.
I did virtually the whole thing in slope mode & it worked well.