I've been stuck in a rut trying to increase the number of idles I can do without reaching for support. While my average is increasing slightly, my maximum isn't. I felt discouraged.
My approach today, which was so satisfying I just had to write about it, was to change my metric. Instead of measuring the number of idles, I made up a new drill which allowed me to feel successful. The new drill was simply to pedal a half revolution forward, rock twice, and pedal backwards a half revolution to my original start position. That's it. Just forward, two rocks and then back. What I liked was that after a bit of practice I could do it. And sometimes I could stay for three rocks, or four.
So my point is that if you are getting discouraged because you aren't improving, then examine how you are measuring success. Maybe a lateral change to a different measure, not necessarily easier, but different, can uncover smaller increments of improvement. I'm looking forward to working on that skill again tomorrow, so that itself is a measure of success.