Hello, I too was feeling as you have explained, I went from 30 day to the 5 day course and both took me considerably longer.
However instead of diving into the 5 day song challenges I started to go through some of the skill courses, currently i’m doing 12 Bar Blues whilst dipping into Fretboard Wizard..
Keep going, its hard when you get a bit disheartened..
All the best
bruverjive..