And often we need to do things we're not that passionate about. You may, for example have chosen to be an accountant even though you'd rather be a singer. But to be even a reasonable successful person, in any field, requires drive.
Some people are fortunate to be intrinsically driven. They do everything with vigor. But if you're not, often these can help:
1. Break it down to baby steps, perhaps giving yourself a reward after each baby step. That's old news but it works, perhaps more often than anything else.
2. Be accountable to someone else: Tell people your goal (e.g., lose 20 pounds, get a job within three months, whatever.) Perhaps have daily check-ins. Or try a dramatic solution: Hire someone for a day or two to monitor you and keep you on-task, for example, in job searching. That may get you into the rhythm. Yes, it may cost you $100 or $200, but you've spent that much on an evening out. This will yield you far more benefit and even pleasure.