As others have mentioned, it's some variation of burnout most likely. It's not that you can't learn anymore. You don't want to learn right now (specifically yo

As others have mentioned, it's some variation of burnout most likely. It's not that you can't learn anymore. You don't want to learn right now (specifically you don't want to learn what you're trying to learn). You're not enjoying what you're doing and your tired brain is starting to protest. Here's what your brain (you) is saying: I don't want to do this. With logical results (I don't want to do this, so I'm not doing this). Some people in this thread have pointed to age as a major factor. It's a minor factor in your 30s as it pertains to learning and it's very unlikely to be significant to what you're describing (Vue and React are not that difficult to learn). Age becomes a major factor for burnout in your 30s though; you've done it for quite a while, so it starts to feel very repetitive, drone-like factory work, and the work hours wear on you differently for all those reasons combined with naturally having a bit less energy at eg 37 vs 22 years of age.