Hi Verone
Thought I would jump in here - I have had my cups for years and not really used them as they are supposed to be used until this summer when due to lockdown I have had the time to use them often!! And I have suddenly got growth, mostly top growth at present, but I am reliably informed that growth starts in different people in different ways, length, width, top growth, so I would suggest if you could increase the amount of time each day - or more than 3-4 days a week if possible then you might see more growth that would last. Sometimes I think any growth fails when you don't keep up the pumping and stretching and if you only use it 3-4 days a week it will take you longer the get permanent growth.
Good luck - I hope you get improvements soon!