If you no longer have any work to do for your client, you may request them to end the contract and share their review. If the contract you are referring to requires editing, the client has the option to edit a contract. Your client has the option to add or edit milestones for fixed-price contracts; however, active milestones cannot be edited. If it's for an hourly contract, your client can increase the rate for you. In case the contract details do not coincide with the specific job details you have discussed, you may request the client to end the contract and send you a new one.