Stimulation ideas

I have a 5 year old male and he’s always been playful but recently he cries constantly for attention and for us to play with him, mostly he likes chasing string, feathers and us but looking for some ideas of things we can get / do for him that provide stimulation without us needing to physically play with him all the time. We have a baby on the way and I’m worried he’s going to feel even more put out 😞