unless you have an own project you want to work on or open source project, in which case 70% busy at 100% market rate is optimal, you just work on your own proj

unless you have an own project you want to work on or open source project, in which case 70% busy at 100% market rate is optimal, you just work on your own project until the next customer comes along. one other point i would add here is that it is often good to have 2 parallel clients, you will have more freedom to say no to mistreatment from one and also less stress to have zero income when a project ends.