follow-up
noun [ C or U ]
uk/ˈfɒləʊʌp/ ussomething that is done to finish a previous action or make it more successful:
Large numbers of unpaid tickets are being written off without any follow-up.
follow-up to sth The letter was a follow-up to a meeting held this month in which staffing issues for the program were raised.
a follow-up call/letter/interview Make follow-up calls to these contacts in the hopes of generating additional publicity.