What will happen to my account if I post off-topic posts quite frequently, albeit not intentionally?
The SE will block your account from posting new questions if your existing questions are judged to be low quality, but the exact criteria they use have never been disclosed - presumably to stop people from gaming the system.
I have read your existing questions, and you are obviously enthusiastic about physics. Can I suggest you ask in the Physics Stack Exchange chat room before posting a question if you are concerned it might be closed. You can ask anything about physics there without fear of your account being blocked.