Now what

When I have a "to do list" i can get comfortable with it... but what happens when things happen and I start ticking off the DONE projects?  It can be scary even intimidating.  I have been working on a book for two years now and the editing is done... I am just steps away from the final project.  While i was waiting and it was out of my hands, i could say "I'm working on it" ... Now it is back in my hands.. so my thought is to add some more to the bucket list so i have things to look forward to and strive for.  I am not sure i want a DONE bucket list a continuing one seems more life giving.