In the past two weeks, I’ve consulted and reviewed four training plans for different athletes. One theme I am seeing is not allowing enough time for recovery after big races.
If you are doing a half-Ironman event, most athletes need at least two weeks for full recovery. After Ironman it is at least four weeks.
When you plan multiple races in your season, be sure you allow for adequate recovery - particularly if you are concerned about good performances. Here is a link to column I wrote that might help.