For me, I try to NOT use the "standard" progressions and changes. They are similar enough, but toss that 2 minor and 6 minor and 3 minor in there too. Consider starting on a minor or anywhere other than the root.

Most of this last batch just kind of fell together, and only once did I have to say "that sounds too much like" and make a change.

If you are most prolific with lyrics, maybe team up with someone who is melody strong and lyrically weak.

Worked for Elton John and Bernie Taupin.