Duas given by ahle bayt

Salaam alekum brothers and sisters I was recently listening to a sheikh talk about how many duas we have from the ahle bayt especially from sahifa e sajjadiya, however a question came to mind if on the day of grader the religion was completed then how can we justify getting these various dua such as ziyarat e ashura ziyarat e arbaeen dua e tawassul dua e kumail dua e jawshan e kabir etc.