If you have excellent physical fitness, but you are not used to playing inside or rarely before, and there are many outside lines, then you just need to practice more at ordinary times and don't be afraid to play psychologically. At the same time, there are also many tips for physical confrontation. Learn more and practice more at ordinary times!
If your physical fitness is not very hard, you should do more strength training at ordinary times, at least 2 hours a day, and pay attention to the combination of upper and lower! It's best to practice your calves first, then your thighs!
Usually look at how others play inside, integrate their own advantages and disadvantages, adjust themselves and help them accumulate experience!