Well, since you at least know that getting complacent and heading back to bartending is a possibility, maybe you just use that as your motivation. You REFUSE to let yourself go back to that life because you want something more.
There's no tried and true advice, you just have to have discipline. It's always easy to go back to something you've done for so long, but that doesn't mean it will make you happy.
Right now, you know that bartending isn't making you happy, so keep in mind that going back will make you content, but not happy.
That's the best advice I have: don't go for okay, go for happy.