Most cars have some sort of protection against theft nowadays. However, they are often fairly ineffective and annoy the people around, especially if they go off in the night.
Alternatively I have seen friends who are fond of really high end sport car brands buying a vehicle in an impossibly lurid colour. This may deter car thieves stealing their cars as they really stand out in the crowd.
Since your car is an essential part of life it makes sense to protect it as best you can against theft. Of course the alarm mentioned above is a deterrent but you could opt for a system that uses a deadbolt. This really tests a thief to try to get access to your vehicle.
It works by programming a code into the door lock design. This particular system is simple to install and doesn’t break the bank to have it fitted.
If you live in a built up neighbourhood, perhaps an immobiliser is the answer to disturbed nights. Whilst this system doesn’t sound an alarm, it will immobilise the car’s engine when someone tries to hijack it. Unfortunately it may damage your car, but at least it has not been driven off.
These devices are more difficult to find than a simple alarm and even if a thief destroys it the electrical system will still be blocked.
Unfortunately, as anti-theft devices are becoming more sophisticated, so are the people who are after your car. Perhaps, if you have an immobiliser and a car alarm, you could have CCTV cameras fitted.
This will realistically only protect your car if it is parked outside your front door, but any delaying tactics are a good move.
Lastly, if you have a garage you should use it as that will prevent opportunist criminals to enter your car.
If you look online for Car Sound System specialist they also sell Car Alarms UK at https://www.incarmusic.co.uk/, https://www.incarmusic.co.uk/car-security-safety/car-alarms-1/car-alarms.html/.