I'm emailing an organisation to offer to do some pro bono (unpaid) work for them. I'm suggesting one or two things that I might be able to do, and want to finish by saying something like "Please just let me know if there is anything (else) I can do to help." I found this lovely phrase in the forums: S'il y a quoi que ce soit que je puisse faire, il suffit de me le demander. But am not sure whether it quite works in this context. Any advice gratefully received!