Posts and media
Use the editorial calendar
One calendar for every network, so the week is visible before it goes out.
The calendar is the same compositions as the composer, laid on days. Write once, choose where it goes, and let it publish while you work.
Open the calendar to see what is scheduled and what has already gone out.
Move a post to another day, or open it to change the words or the networks.
Leave gaps on purpose. A full week of filler is worse than three posts you meant.