Maintenance isn't technical. It's a monthly ten minutes and the willingness to delete things.
Put a recurring reminder in your calendar. Open the site as a visitor. Check that the automations fired and the newest content is there.
Then delete something. Features you never use make the ones you do use harder to find.
Keep a running list
Whenever something irritates you, write one line. Once a month, fix the top two. That rhythm keeps a project alive for years.
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