Ok so I’m doing something with my three year-old

I’m doing something new with him. Every time he listens to me, I clap real loud and I say good job. We’re so proud of you and blah blah blah stuff like that cheering him on instead of rewarding him with something I just clap and so far today it’s been successful. I noticed his attitude has changed. He’s actually been WANTING to listen to me. Such improvement in just one day. Because these past couple days have just been hectic since the kids have gone to school and it’s just been me and him and his baby sister.