Hello, welcome to the computer help forum. You'll find here a very friendly and helpful community of experienced computer users as well as newcomers.
There are many senior citizens who have communication skills and would be glad to help you without payment . However, I think it would be best for you to check in your local area and see if you can make personal contact with someone in your own community.
Please allow me to be frank, I have been using the Internet for many years and in recent times I have seen more and more scams and frauds than what could possibly be imagined. So I would be very cautious about putting any kind of advertising or solicitation on the Internet unless you absolutely know exactly what you're doing.
Besides other members in your senior citizens community, you might also want to enlist the help of the local community college. There may be youngsters there who are developing their writing skills and would enjoy working with you and also get college credit for their work.
And by the way, you can tell that I am not a professional writer. There are some typos and grammar errors in this post. I have very poor vision so I do this by dictation. So far, the computer does a fair job of understanding what I say, but sometimes it makes him hilarious mistakes.