Grammar tips

Hello, I’m learning japanese since July 2022 and lived from August 2022 until July 2023 in Tokyo, where I learned japanese on my own with Anki and talking in my jobs I found in Tokyo. I learned 2400 words with Anki, but never learned them with sentences. The grammar I learned, was from Busuu, but I still don’t know much rules, just some basics. I know many words but can’t speak freely, without thinking too much. I buyed some Mangas in japan to practice how they write sentences their and watch sometimes easy Japanese on Yt, but still don’t rly get most of the rules. My native language is german. Could someone share me their experience, with advancing their grammar ability? Thanks a lot for help beforehand.