If your car keys are not working as far as they used to, there are a few things you can do to try and increase the range. First, check the batteries in both the key fob and the receiver. If they need to be replaced, that should help with the issue. If that doesn't work, there are a few other potential solutions.
One is to use a key fob signal booster. This device amplifies the signal from the key fob so that it can reach further. Another option is to replace the antenna on the receiver unit in your car. A third possibility is to add an RF repeater system, which will extend the range of any wireless signal, including your car key signal.
All of these solutions require some technical knowledge and should be done by a professional if you're not comfortable doing them yourself. But if you're willing to put in some effort, they could help increase the range of your car keys so that you don't have to worry about being too far away from your vehicle when you want to unlock it or start it up.