If this senior is not a student who likes to sit in the library, he can get to know the girls in the class first. It's easier to get to know the seniors, and then go to their class to find them when they are here, ask them if they have seen them, and then meet again after chatting, so you can say hello.
Or watch him play in the playground instead of in the game. If he plays at ordinary times, he will notice you.
Come on, little MM ~