I'd say that problem is located in the intensive learning after which you probably experience a small burnout. Slow down your learning pace. Try to learn a bit

I'd say that problem is located in the intensive learning after which you probably experience a small burnout. Slow down your learning pace. Try to learn a bit every week on the topic that interests you. Write down notes and see a progress, which should keep you going. I motivate myself but doing a bit everyday, while I don't do that much daily, monthly it adds up. :) Hopefully it helps, good luck.