It's psychology. Everything is.
If it sits where you can ignore it, it will be.
Get it drivable.
Drive it once a week like clock work.
Dedicate 30 minutes (I have time after the kids go to bed) every week.) Schedule this in your calendar if it helps. If it's maintenance, good. If it's repairs or upgrades, or detailing, good. Make it a routine.
Learn automatic saving. There is NOTHING wrong with budgeting for transportation, no matter what someone else tells you. If that means you lock $50/paycheck in the trunk in a small box, good. If you automatically move your direct deposit or funds to an alternate account, good. Prioritize a list of to-do stuff so the saved gets spent and so the car gets better. Safety first. Function next. Cosmetics last. Taking your kids for a drive once a week to get grocery items or to the park is waaaaaay more important than a crinkley ugly vinyl roof someone else complains about.