Q: Horn does not function when needing to warn vehicles

For three or more times when it was a necessity to warn another vehicle in order to prevent a collision, my car’s horn has not functioned. For example when another car was changing lanes and wasn’t looking or when a car was backing out of the driveway and the driver isn't concentrating. For the horn to work, I have to press extremely hard in the large center of the steering wheel. It is very difficult to activate and I’m a very strong guy! There is way too much resistance when I push in the steering wheel’s center. It can be very dangerous to see a car backing into you and not being able to warn them, thus causing an unnecessary accident. What do you suggest as the solution for this horn problem?