Keep things short. Don’t overexplain.

That background you wrote? It should be shorter.

That NPC personality? Do you need that much detail? Try dot points.

If you take over a page for an encounter, it’s too long. If it’s over a column, can you shorten it?

Adventures are read twice, if you’re lucky. Once to prepare, and once during the running.

When a DM runs it, they need to find things quickly. Use headers to call things out. I like those bold italic headings in the D&D adventures.

Too many moving parts? Hard to remember and hard to find during play. Try three different things as a maximum. Adjust based on feedback.

Include a synopsis of the action.

Playtest. Proofread!