Most timeless things are simple. Simple lasts because it doesn’t need to be explained.

Complexity ages badly because it depends on context, and context moves. A thing with few parts can be understood by someone who shares none of your references, which is why plain ideas and plain objects survive the decades that swallow clever ones. Simplicity is not a lack of thought; it is usually thought that went all the way through.

Take something you have made or said that needs a preamble to land, and cut it until it does not. Explain your idea to someone outside the subject and watch where they stop following. What survives that is the part worth keeping.