Strength training + conditioning tips please!

Hi, I’m a female teenager in high school, and I’ve been hitting a plateau for the last year. I feel like I’m getting better technical wise, but I don’t have the strength or endurance to stay at that level at tournaments. Also, I go to a smaller club, and in the past we used to have a day designated to conditioning but we don’t really do that anymore. Does anyone have any tips or suggestions?