One thing I have been thinking about is, when I am watching some anime or Japanese movie, I would love for it to have the Japanese subtitles and English subtitles at the same time. Is that something any of you have found so far?
There are (slightly sketchy) websites that provide this, namely animelon.com and daiweeb.org
I would recommend trying to switch to pure Japanese subtitles sooner rather than later. I feel like your eyes just cheat and jump to English if its there. Also, you want to try and and eventually go from words → meaning, not words → english translation → meaning.
I would also recommend rewatching shows you have already seen to make it easier at first.
Many people mine vocab words with context and make anki cards from shows/manga/LNs/games, which can be a good method to study vocab.
Subadub and LLN are wonderful. I also wanna throw in a recommendation for either Rikaikun or Yomichan, which let you see word definitions just by hovering over them. If you like Yomichan, import this dictionary and it shows you the word’s JLPT and WK levels as well. Unlike regular Netflix subtitles, LLN and Subadub both show the subtitles in selectable text so Yomichan works with them.