I can relate with your frustration, I have wanted to quit countless times. My “trick” was to actually quit. I looked elsewhere for help, sometimes even following the suggestions of other students.
As I looked into these options, I discovered that the Practice Portuguese structure was the best available resource I could find.
Another piece for me is that I am considering moving to Portugal within the next 2 years. This gave me the impetus to go back and try again.
I changed my approach to my studies by slowing down with each of the lessons, utilizing the bookmarked pages to work on repeating certain lessons, verbs, podcasts, etc.
In summary, it may be in your best interest to come at the learning experience from another perspective.