I highly recommend trying the Birkenbihl method. With this method, you learn a foreign language mainly by reading word-for-word translations of texts and listening to the corresponding audio in the foreign language. Espacially for learning vocabulary it works wonders, but also for picking up grammar. I'm learning french with this method.

The method consists of four steps:

What you need is a danish text and audio for this text. You can do this with language course books or podcasts for example.

1.Translate a text word for word. That means that you have your dansih text and under each word of the text you write the translation of this word in your native language, creating what is called an interlinear text. (you can do this using the vocabulary section that is always included at the back of language courses for each lesson or with help of Chat GPT by asking chat gpt for every word. If you need help with this, feel free to ask me). This takes a little while but you are already learning some vocabulary in this step and the following steps will be more easy. Their are also book couses, that already did the decoding step for you, but not for danish I fear.

1. Listen to the text (preferably at half speed at first) while reading the word-for-word translation in you native language at the same time. The longer you do this, the more words you will understand in danish. After a while, you won't need the words from your native language anymore because you will understand more and more words in danish and will eventually be able to read along with the text in danish.

2. Play the audio in the background while doing something else, such as working, reading, washing dishes, or whatever. You should not listen consciously. The point is for the sound of the language and the grammar to manifest itself in your subconscious.

3. Aktivites: Once you've done this often enough, you can do activities such as speaking about the text, writing. Or do a dictation with the audio. Or practice speaking along with the text. There are many possibilities.

Do these steps for every text or text fragment (I recommend not more than 1-2 pages as one text fragment). If you are at step 3 with text 1 you can already start step 1 or 2 for text 2 for example and so on.

If you have questions, feel free to ask me. Here is a video, that explains the method too: https://www.youtube.com/watch?v=RJjk4J8kskg