If you cannot find motivation in forgiveness to benefit the other person, then find the motivation to forgive in order to release yourself. When you don't forgive, you believe that you are punishing the other person and that you are the jailer who keeps them in prison. But that is false. By not forgiving, you act as your own jailer. Your peace and joy have to be your motivation. Not forgiving someone gives you a false peace and joy, a falsity that you give justification to by "making them suffer for their words or actions (sins)." Forgiveness brings you true peace and joy, God's peace and joy. This is a complete release which frees you.
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