The best life hack I use that is widely available is a bicycle. I ignore all the ads for cars (and everything else - if it needs an ad, there's a value deficit.) and focus on the facts. Getting around downtown, bikes are the choice of couriers, because they win all the races against cabs, transit, scooters, and cars. Ivan Illich calculated that by the time someone has driven downtown, found parking, walked to their destination, and paid for all that, they have averaged a fast walking pace.
Using a bike isn't just faster - it integrates healthy exercise into your day. If you are too busy to go to the gym, you'll be pedaling harder and getting more exercise to burn off that adrenalin. Riding in traffic is a sport that distracts from the fatigue, and it also offers plenty of mental exercise. An experienced rider can pace an novice and use HALF as much oxygen. A lot of people think that their area is unsuitable, but if you explore it by bike, you can find places where work, home, and shops are in easy range. You can do a much finer-grained search by bike.
You can carry enough camping gear for an indefinite tour, and look a lot more acceptable than someone carrying bags. You can quickly leave an area you don't like, and be hard to follow on foot or by car. You can fix it yourself. In cold weather, when bus queues are huddled and shivering, you have central heating. And you never have to wait, look for parking, endure the chatter of other passengers, or worry about the image your car projects.
It is also so cheap that a friend of mine with a standard government salary had paid off a house in a big city before he was thirty, never having owned a car.