Congrats on hitting your goals! That's awesome! The one and only time I wrote 50k in a month, I definitely had a longer fic to work on, which absolutely helped in terms of knowing you had something to work on. But I also found just working on one thing (for me) so consistently to be a bit of a slog, so I definitely broke it up with a couple of various smaller fics as well. And because I had such a big goal to hit, it meant I made good progress on my long!fic AND finished a bunch of shorter things. :)