i tend to build things for others so usually keep my builds in the order i have promised them, i am currently finishing up 2 Dr Doom heads, 1 Shrek head and 1 Loki staff, the pep side is built now i am in process of strengthening and mounting, next is a unicorn head for a friends daughter followed by an elephant head for a friend, as well as these i have several 1:6 scale iron man models from
www.paper-replika.com to build for myself, a bumblebee model with lights to build for my g/f, the arkham knight cosplay for myself using bandiets awesome files, not to mention a host of other transformer and iron man files waiting to be printed and started. my own projects tend to be attended to as and when i feel like it, those i have promised to others get done a little quicker and as i said earlier in the order promised.
my suggestion would be to work out if you need any of your projects more than others and prioritise them that way, if for example you need something for a convention then that would be the first to get done.