Ask What do you do when a client wants to negotiate the price after the project is already done?

[Edward22]

This situation can feel unfair because the work has already been completed based on an agreed price. At the same time, some clients may still try to reduce the cost after seeing the final result. It can be hard to respond without damaging the relationship. I am wondering how freelancers protect themselves in such cases. Do you stand firm on the agreed price, or try to meet them halfway? What steps can prevent this from happening again?