Peter Mead has put together a collection of 50 ways in which preaching might helpfully be tweaked.  Here’s a summary, in a mixture of his words and mine:-

1. Be mastered by one book of the Bible.
2. Invite others into the preparation process.
3. Use notes less.
4. Focus more on the passage you are expositing; use fewer cross-references.
5. Craft the main idea a bit more.
6. Target relevance in your introduction.
7. Use REF (review, encourage, finish) to conclude.
8. Make sure your transitions are slow enough and clear enough so people can follow you.
9. Read a book about preaching.
10. Get some helpful feedback.
11. Watch yourself on video.
12. Go somewhere in the Bible that is outside your comfort zone.
13. Avoid moralising; point to Christ.
14. Add vocal variety.
15. Get rid of that distracting mannerism.
16. Smile.
17. Use your preaching space more effectively.
18. Step outside your usual preaching mode in order to communicate more effectively.
19. Show, as appropriate, your own vulnerability.
20. Try preaching in the first person (i.e. from the perspective of a character in the text).
21. Stop counting sermon prep as your personal Bible reading.
22. Turn your points into sentences.
23. Print and annotate your Bible text.
24. Adjust your preaching space.
25. Mix up your illustrations.
26. Go on a one-week illustration hunt.
27. Evaluate a master-communicator.
28. Rehearse your message out loud.
29. Pray for the people – individual by individual, family by family.
30. Try preaching a biblical theme rather than a biblical passage.
31. Teach your hearers how to handle the Bible for themselves.
32. Increase expectations and encouragement.
33. Learn the local dialect (this includes using the dialect of John, of Luke, and so on).
34. Keep your message simple.
35. Don’t simply outline your message, map it.
36. Preach a whole book in one go.
37. Preach a tiny text in context.
38. Increase your eye contact.
39. Prepare your hearers for a future evangelistic message.
40. Evaluate your visuals.
41. Come out from behind the furniture – communicate with your whole body.
42. Make your gestures bigger.
43. Discover which aspect of your delivery is weak or faulty (voice? gesture? eye contact?).
44. Make sure your gestures are the right way round (for your audience)
45. Practice storytelling at home.
46. Read some descriptive writing.
47. Pray about improving your preaching.
48. Nail your ending
49. Have a break
50. Make a list of your prayer needs concerning preaching