How do you structure AI prompts for recurring tasks?

I've been using AI for weekly reporting and content drafts, but I'm still inconsistent. Every Monday I end up rewriting the same context and instructions, and the output quality varies a lot. Do you keep a prompt template library? I've tried saving snippets in a notes app, but maintaining them across tools feels messy. Some people mention using project folders with a master prompt and pasting in fresh data each time. Curious what actually works in practice for repetitive workflows. Also how do you handle cases when the model forgets formatting or tone rules after long conversations? I'm considering switching to some dedicated workflow tooling but want to hear how others solve this before over-engineering it.