Well, two of them you mentioned, ض/ص you can imagine the tongue making a bowl shape when you say them.
Polish has a retroflex and palatalized “sh” pair of sounds (Sz vs ś) that I can pronounce perfectly but not clearly distinguish as a listener.
I learned Polish when I was 5, moved back to the states when I was 11, barely used it for 7 years, and relearned it when I was 18. I don’t know if (at 5) I ever distinguished between the two. But I certainly struggle now.
To be fair, I've only been learning for a short while (8 months or so) and haven't had much opportunity to listen to a lot of different speakers so perhaps this may get better.
That said, any other tips on pronunciation are greatly appreciated! I did not realise that the tongue makes the same shape with both letters - I was not making a proper bowl with ض.