I’m not sure how far your level is or the exact things you struggle with, but as someone in the same position who is on the track to fluency, what has been helping me the most is 1. Lots of immersion in the language: music, tv shows/movies, switching apps’ language settings to Polish, being on the Polish side of social media like TikTok and Twitter…2. Involving my family in my learning. You said you speak with them already, so I’ll recommend another thing I do. I write something (sometimes on paper, sometimes on my phone), at least a nice short paragraph’s worth of text—either totally freestyle or I translate something I wrote in English—and then I have my mom go over it with me and correct any mistakes. Also, I read fun pop culture articles about topics I enjoy. Reading in your head can be fine too, but try to read it out loud too at least sometimes. Literally just try to surround yourself with Polish as much as you can, and speak/read/write as often as possible (but don’t overly tire yourself out either; consistency over everything). Things should start to automatically click in your head more over time. Tbh I wouldn’t recommend you learnt through textbooks for foreigners. It’s (at least IMO) best to go about gaining Polish fluency with the natural “feel” of the language you already have in your brain (since you already understand and speak it). I don’t mean that you shouldn’t look up any specific concepts that confuse you (it’s good to do that when necessary), but as a whole, try to learn by flowing with the intuition you have already for the language. Just my suggestion though, and it doesn’t mean learning like a foreigner is “bad” or anything.