I wouldn't consider myself a master of the language yet, but here's a small list of some things that helped my self study

• mango languages is what I got started using. It's free from my library
• following Brazilian social media accounts (meme pages, influencers, etc. on Instagram)
• watching Brazilian dubs of anime (I was watching knights of the zodiac, but haven't watched in a while
• reading Brazilian webcomics alot of the popular webcomics have PT-BR translations. I was reading the gamer for a while before I stopped for a while.
• read a Brazilian fighting game website @ https://pulenao.com.br/
• recently found a Brazilian TV channel on roku called com Brasil.

I don't do all of these at once I even haven't done some of these in months, but they've helped me expose myself to the language.

P.S. thanks for your hashtags. I had no clue how to refer to Brazilian Portuguese in Japanese. I'm trying to learn that language too. Io