Take the time to study the craft, to study the architecture and weight of a line. Actually read what you are about to post before posting it. Say it out loud. Get your ear involved. Get in the habit of rewriting, that is, going over a piece of text until it shines, until all the lumps are gone. Read great writers. There are many of them still out there, both Christian and non-Christian. There are bad writers out there as well, and their numbers are increasing. But they have something to teach us too, even if it is simply what not to do.