Not Japanese speaker here but Windows media player and I’m sure others let you play video at various speeds. I always found that helpful. Also I always most preferred learning language audio with captions also in the foreign language. I think it helps you catch what exactly is being said (unless, as happens, the captions are using different paraphrased lines from what’s being spoken). Don’t bother with captions in your native language.
Also, make sure you are practicing creating language. It’s all well and good, especially as a beginner, to just want to shore up those passive listening and reading skills but I cannot overstate the importance of the active writing/speaking skills. It’s much harder yes but you’ll be glad you did it from the start.
also, don’t gloss over any tedious and difficult grammatical stuff like learners tend to do. Learn your word genders or whatever Japanese has. You’ll thank yourself later.