Actually, that's a great idea!
As my services are currently freelance I have to modify it a bit differently...
Perhaps something like this for freelance work: "We can either start next week or you'll be on your own with this project." Hm...I dunno...that might sound a bit threatening. 🤔
I guess a nicer modification might be, "Without my development services I see it's quite a struggle for you. You're welcome to go without them, but I'd love to help you out." That sounds nicer.