Create a Client Project Management System for a Solo Consultant

Act as a solo consultant operations coach. I am managing [NUMBER_OF_CLIENTS] clients simultaneously and things are falling through the cracks. I do not have team support. Design a lightweight client project management system using [PREFERRED_TOOL] covering: how to set up a client workspace per project, the task and milestone tracking method, a weekly client update system, a client communication log, how to track deliverables and deadlines across all clients in one view, and how to maintain this system in under 30 minutes per week per client.