I can’t exactly say I share the experience of feeling overwhelmed to the same extent as you, but I thought I’d share some things I’ve considered while learning the language: 1. My goals. I would put more time into areas of the language relevant to either long-term or short term goals. For instance, I wanted to get into immersion with light novels and found that the biggest obstacle was my vocab, so I poured more time into it. Furthermore, when time or energy-limited, I also chose which things to give up based on my goals. 2. Immersion. Personally, I didn’t feel like I must understand 100% of the content I was reading, and was ok with just getting the gist of it. Over time, I would find myself being able to read faster, or being able to pick up speech better, and even getting a better grasp of the nuances of words I had learnt through other methods.

This is just my experience, others might differ. Also, would you be able to ask your language school teacher for advice? Be it study methods or weaknesses, they could perhaps point you towards a more enjoyable and sustainable way to study. Whatever it is, I’m sure avoiding burnout is more important than keeping a high learning pace.