Hello, Project Owner.
I'm interested in your project. I hope you won't close it before the original deadline you set at the beginning. I will submit my design within the next 2x24 hours. I hope you'll be willing to wait for it.

Thank you.
Best regards.

Hello, thank you very much for your message and your interest in my project.
Of course, I will keep the project open until the originally set deadline, so you will have enough time to submit your design. I’m looking forward to seeing your proposal and I truly appreciate your effort and creativity in advance.