Compiling your answers into semantically sensible standalone posts- that's something that some specific people do very well, very easily, as easily as you respond.
Whether it is economically advantageous for you to hire someone is a different question- answer is probably not- but if you knew someone in the Rust space who was an editor rather than an author, they could, in 2-3 hours a week, scan your posts, distil the useful elements, and write something for you to approve and post. Very common workflow in the publishing space.
Ghostwriters are this at book-scale- interviewing the named author, which, like forum posts spurs answers, which get aggregated into subject areas and distilled using a common voice.
You definitely don't have to beat yourself up about it, or try to solve it with "activation energy" processes- which to be fair sometimes work. Some people are just good at some stuff and other people good at other stuff.
Cheers, good luck.