There's always something to do. lol
Promoting alone is a full time job, however there's also researching how to go about publishing it or will you court a publishing company, attend events and make contacts, networking, research distributors and find out what needs to be done to get into stores and libraries, really the list goes on and on. Researching conventions and book shows, making connections at local comic stores, getting into their store events and ask if they're into carrying indie books, crowd funding, putting on events for readers, ask for reviews, get in on podcasts, ask to be interviewed, on and on and on. Research and look into different revenue streams you can setup with your series, build those streams. Oh gosh, I'll probably just keep adding to this list as I think of stuff.