Congrats Snugglesnort! Here some tricks that are usefull as step-ups before starting with actually juggling 5 balls:
The Flash:
JuggleWiki - Three Ball Flash
The 50505
JuggleWiki - Three Ball Snake
I think the 4 ball crossing is still very hard maybe as hard as directly start with 5. The advantage is that you have one less ball but that the rythm is constantly broken makes it also hard in a way that you don't have while doing 5 balls feeling much more fluid and logical.