"I haven’t broken a string, so I don’t need a restring." This is the biggest misconception in recreational tennis.
Strings degrade from the moment they are pulled. Polyester strings lose up to 20% of their tension within the first two weeks, losing elasticity and going "dead." When this happens, shock absorption plummets, transferring stress directly to your arm.
For a club player, the absolute baseline is restringing at least twice a year: once at the start of summer to dial in a firmer tension for hot weather, and once at the start of winter to drop tension and compensate for the cold, dense conditions. For the heavy topspin string breakers, if you are snapping poly in under 10 hours of court time, your setup is failing you, and we need to look at a thicker gauge or a specialized hybrid.
You also have to protect that investment. Keep your racket in a temperature-controlled environment and keep it out of extremes like the back of a hot car. Many manufacturers no longer supply covers when you buy a racket, so invest in a good thermally protected bag. Understand that temperature greatly affects the longevity of every physical variable in tennis: the racket, the ball, the strings, the court, and the atmosphere. Control what you can.