Hooking up on the internet after a divorce might seem like an insurmountable challenge. Before getting into anything specific, we have to take care of the basics.
Use a flattering picture. Not a selfie, if at all possible.
If you have any doubts about this whatsoever, get a female friend to help you. Make it a couple of simple, unpretentious, and funny paragraphs.
In other words, treat them like human beings. Make your messages brief, respectful, and reference common interests.
Just be warm and chatty. All of that applies to all online dating. And this is a huge mistake.
You have to put in some effort. Unless you look like Daniel Craig, charm will be required.