What is the ruling regarding the prayers I performed previously, knowing that I used to experience drops of urine after urinating and was unaware of the Shariah ruling, and I exerted my utmost effort to find out what was correct? Do I have to repeat them?

According to the Maliki school of thought, this impurity, which exits involuntarily, is pardoned as long as it recurs one or more times each day. Therefore, your prayers, according to the Maliki school, are valid, and you are not required to repeat them. Acting upon this opinion after the event has occurred and rectification is difficult is permissible, and there is no blame in your doing so, nor in not repeating any of those prayers. In the future, you should take precautions by placing a cloth over the area, then removing it and performing ablution when the discharge ceases.