There are many negotiation tactics. Here are quite negotiation tactics few of them. In negotiation, there are many tactics that you may meet or use.
Indicate bad publicity of not agreeing. Saying what you will do. Assert things that are not true. Do that and I’ll give you this. Ask to be paid up front. New person can reset the rules.
Show how clever you are. Buying time and building tension. Show you’ve nothing left to exchange. Appeal to their need for esteem from others. Control what and when they eat and drink.