If I've been away, I usually end up getting back into RP by lurking, and otherwise chatting with fellow RPers that I've had significant plots and character relationships with. I'm fortunate to have long-time writing partners who are happy to pick things up whether it's been months, a year, or more, because they are as invested in the depth and breadth of our stories.
We all know that our lives are or can get busy, and so if one of us vanishes for a while, we simply write other characters or maintain that the link is still there while they're absent.
Loyalty to your co-writers is important. They're more than just co-writers, they're friends, and roleplay has bonded you. Honor that.