I would not open a UTM builder before I know what question the campaign must answer. Builders make tagging easy. Easy tagging without rules creates GA4 graveyards.
Pick one campaign name
Write it down. Share it with anyone posting links.
Build once, reuse
Same source and medium conventions every month.
Test the click path
Click your own link in an incognito window. Confirm params survive redirects.
A UTM builder is a label printer. You still need a filing system.