Your load sounds pretty good come September. You may actually enjoy having less kids around during the day because it serves as a little break.
Perhaps it is the winter blues that are kicking in for you. January and February are my least favourite months of doing daycare. I find that January and February are really tough because we are inside more and the days seem long without us being able to be out as much.
If you do decide to terminate; then definitely decide which kids/parents are the easiest and will fit into your day the best. Try to visualize who you want in your daycare going forth