I've always enjoyed trying these, even if I may fall behind this November (I'm going to a convention at the end of November, and I'll be busy running a big game, so that may chew up writing time).
Ideas I've suggested previously but never got round to:
A vis source a day - always useful, and if I run out of good ideas I'm sure I can still come up with enough so-so ideas to finish the month.
Marcus of Paris' recruitment ledger - attempt a grog a day, with the framing story that they are known to the redcap Marcus (from The Lion & The Lily) who recruits staff for Normandy covenants.
A wealth creation scheme a day - I'm sure there must be at least 30 good ways to use magic to earn money.
A covenant idea a day.