What is a topic for an persuasive essay?
Anything people would argue with you about!!
Read through here for ideas:
http://guidetogrammar.org/grammar/composition/argument.htm
and
http://guidetogrammar.org/grammar/composition/crywolf3.htm
https://www.powa.org/convince.html
https://owl.purdue.edu/owl/general_writing/academic_writing/essay_writing/argumentative_essays.html