After a material breach, the innocent party may have remedies under the contract or applicable law.
Possible responses can include giving a formal breach notice, requiring the breach to be fixed, suspending performance, claiming damages or terminating the contract. The available remedy depends on the wording of the contract, how serious the breach is and the law that applies.
Many contracts include cure periods, notice requirements and termination steps that must be followed carefully.
This answer is general information, not legal advice.