50% of your racquet´s response is determined by it´s frame, the other 50% by the choice of strings and string tension.
Unfortunately, while the frame will last a long time, the strings will wear out pretty quickly. Most strings feel "dead" after about 8–10 hours of intense hitting. This means that their ability to contract back to their original shape after expansion has largely been lost. They have become inelastic.
The consequence: Inealstic strings generate less power and convey less feedback. Feeling and control disappear. In addition, the risk to suffer from "tennis elbow" and joint problems increases due to the poorer shock absorption on ball impact.
The stringster app helps you to identify the right point of time to actively replace a worn out strings – and to experiment with different types of strings, string gauges (diameters) and tension levels. This is how you can find out how you can optimally adapt your racquet to your personal needs.