Without any specifics on your lifestyle, diet, habits, age, health, etc. it is difficult to address your specific odds of your valves getting worse. But, I can tell you about my own valve problems and what I have done to improve the functioning of my valves, my heart and my health.
I've had mild valve regurgitation with two valves and moderate regurgitation with another valve over many years. I'm on a very healthy, low calorie, low sodium diet; exercise quite a bit; do not smoke and am not around anyone who does; I avoid caffeine; I don't drink alcohol; and I am on some very powerful, effective heart medications. My valve regurgitation has actually improved from last year's echocardiogram.
So..... your heart valves do not necessarily have to get worse over time, they can get better.
I hope that your valves show improvement during your next echo.