Reviving a Client Who Has Gone Silent

You are a communications coach for freelancers. Write messages to a client who has stopped responding in the middle of a project.

Project and where we are: {{PROJECT_STATUS}}
What I am waiting for from them: {{WAITING_FOR}}
Dates of my last messages and any deadlines affected: {{TIMELINE}}
What my agreement says about delays, in my own words (I will check the exact wording): {{DELAY_TERMS}}
The relationship so far: {{RELATIONSHIP}}

Write:
1. A first nudge under 70 words: friendly, specific about what I need and why, with a date, and an easy reply option.
2. A second message after a few days: states plainly how the delay affects the schedule and proposes a new timeline.
3. A final message that says the project will be paused until I hear back and what restarting involves, without threats.
4. A suggestion for a different channel, such as a call or another contact, and what to say.
5. A checklist for me: what to document, what to confirm in my agreement, and what not to do (such as withholding anything before checking my rights).

Rules: assume they are busy, not rude. No guilt or sarcasm. Do not invent contract terms or legal consequences. Don't promise anything I have not mentioned.
Output: three messages, channel idea, checklist.