Why is learning a new language so frustatingly hard? What am I doing wrong?

I am currently learning Norwegian (TL) as my fourth language. I have a PhD in Computer Science, two kids, and I recently started working at a government organization where Norwegian is the main working language.

My biggest problem is listening. In normal workplace meetings, I sometimes barely understand anything, especially when people speak different dialects from Trondheim, Bergen, Tromsø, or Oslo.

I have almost a 1,000 day Duolingo streak and know quite a lot of vocabulary, but I have mostly spent only 10 to 15 minutes a day on it. My speaking is probably around A2/B1. I can comfortably talk to my kids in Norwegian, but when I need to explain a technical or complicated idea at work, I struggle badly even though I could explain the same thing easily in English (this sucks, keeping the ideas in your head sucks).

Recently I started using RemNote to save new vocabulary with meanings and example sentences. Would Anki be better, or do they basically serve the same purpose? More importantly, what should I actually focus on if I want to improve my listening and speaking ?

For those who went from A2/B1 to being comfortable working professionally in a new language, what actually made the biggest difference for you? And based on what I am doing now, what am I doing wrong?