There have been lots of great tips offered already but I'll chip in my two cents as well
Fastpass+ either Frozen Ever After or Test Track. These two rides are quite prone to temporarily breaking down. If this happens during your fastpass window, a special fastpass will automatically be added to your My Disney Experience account which can be used at any time in the park that day for most rides (sometimes with a few exceptions). This is handy!
If you choose to FP+ FEA, then RD TT and use the single rider line. If you choose to RD FEA, then FP+ TT. From what I've read online, it seems to be equally easy to rope drop either one.
If you can't get Soarin' as a 4th, 5th, 6th, etc. fastpass, then use standby whenever you see that the wait time on
MDE is relatively low. Perhaps you could hop onto Soarin' after your initial rope drop attraction.
Note that I've gotten all three of these rides as 4th, 5th, 6th, etc. fastpasses on crowd level 6 and 7 days. I kept refreshing MDE until they eventually popped up.
I hope you have a magical trip! I'm going in January, too!