Favourite toys for independent play?

Hi, I’m hoping to get some ideas of toys for independent play. I’ve just had my second baby and my oldest loves being a big brother but is struggling a bit with the fact that I can’t play with him on demand now. It’s not too bad at the moment as my husband still has another week and a half at home but I want to try to sort out our play situation before he goes back. Our play space is in our front room so there’s not loads of room and I feel like since his third birthday and Christmas it’s been filled with toys that he uses for two seconds and then is bored of 🤦🏻‍♀️ Thanks in advance!