I've tried a lot of different methods to learn Dutch. Apps, textbooks, podcasts. They all work to some extent but I always struggled with motivation. Until I started using youtube seriously.
The thing with Youtube is that once you find content you genuinely enjoy, you don't need motivation anymore. The content itself pulls you in. You're not studying, you're just watching stuff you can't stop watching, except it happens to be in Dutch. That's when immersion actually works, when it doesn't feel like work.
Edit: I forgot to mention that I use the bingy chrome extension to help with my learning when I watch Youtube. There's a button you can click on any subtitle to get an explanation of the grammar or slang in it.
The problem is that your regular youtube account won't suddenly start recommending Dutch content just because you decided to learn dutch. Your algorithm is trained on years of your native language habits and it won't let go easily.
So here's what I did to fix that.
1. Create a separate Youtube channel just for Dutch
I recommend creating a new channel rather than a new account, that way if you have Youtube Premium you don't need a second subscription. There's a detailed guide with pictures that walks you through the whole setup here
2. Change two settings
Once your channel is created, change the location to the Netherlands and the account language to Dutch. This gives Youtube the right signals from the start.
3. Train your algorithm
Search for topics you already love, just in Dutch. If you like cooking, search for cooking in dutch. If you like football, same thing. When a video in your native language sneaks in, click the three dots and hit "Not Interested." After a few days your feed will start looking very different.
Once that's done, the magic happens. Your feed fills up with content you actually want to watch, and you just... watch it.
That's it. Hope it can help as it really made a difference for me. Feel free to share other tips in the comments, I am always looking to improve my learning system.