If you are asking about your playlists and favorites when you unsubscribe from Premium, they will stay in your account for an unlimited time, so you do not lose them as a Free user.

Yes, except that I found out the hard way that if Deezer suddenly decides that it “doesn’t support Deezer Free in your country” (in my case, Israel), there is no way for you to even see your playlists So don’t count on being able to see your playlists even one minute after your paid subscription ends.

Thanks for your help @bluezzbastardzz! 

Yes @FIRAT AYDIN, always when you change from a paid account to free account, your playlists and music will be on your account without problems and on the case of @Nadav Har'El, when you pay and return to Premium or Family, you will see your music again. 

Have a great day!