@Slickback
I started by immersing myself in Spanish literature (journalism, poems, short stories, etc.) as well as YT videos and all sorts of nonsense. I wasn’t so concerned about learning every new thing I encountered, it was more about understanding the composition of sentences. I quickly realised that upto 30% of it was lifted from idiom/ strange phrases that just don’t mean much to the non-native speaker.
Then I decided to do A-Level Spanish when I was in the middle of year 13 and I had three months to prepare so I started to use all sorts of websites to try to improve my grasp of the language. The best thing that happened to me was meeting that rapper because when I went to meet him he was staying at a hostel filled with Spanish speakers. I made friends with a guy from Peru and he literally messages me every day, forcing me to write/speak in Spanish. He still doesn’t speak any English lol.
I think you should try to write as much as you can and put yourself out there, people really like it when you’re trying to learn about their language and culture. It feels like Spanish has opened the world up to me, I would have known about Garcia Marquez or Borges nor would I have had such a close relationship with my Colombian neighbours. For Portuguese I am going to try to write something every week, this week I'll answer these questions:
¿Qué tipo de persona eres?
¿Cuáles son tus objetivos a media y a largo plazo?
¿Crees que tus objetivos son realistas?
I wrote them in Spanish just in case you wanted to try too.
Post them somewhere so someone can correct it for you and you would have learned a thing or two pretty quickly.