3 month old activities

My son will be 3 months on March 12th💙 what activities do you mamas do with your 3 month old? Currently I’m singing to him, reading books, doing tummy time, talking to him. I’m gonna get

Him a tummy time gym play mat he should be ready right? What else that’s new that we could do? I love looking on Pinterest and seeing what activities I can do to help him learn 🥰