Things to do with 5 month old?

I need some ideas please on things to do at home with my 5 month old?

She needs so much entertaining, and I feel like I’m on an endless loop between her naps of playing with the same toys, then tummy time / practicing sitting etc, then singing songs, then playing with her ball pit etc. I can tell shes starting to get bored as well and I feel like I’m putting her in front of the TV more and more and thats not what I want to do 😩

(I do go out for lots of walks and outings and things, but I need ideas for when I’m at home please)