Thanks for your query.
As mentioned by you,your child is having high grade fever
and i appreciate that you have given him cool bath and medicine,but i will suggest you to take him to doctor as febrile seizures
is common in this age which needs to be evaluated,in the meantime continue with paracetamol
after every 6 hours,do tepid sponging,give him plenty of fluids,
Your child will be fine