Keeping baby entertained!

So baby is nearly 6 months now and I’ve been trying to keep her as entertained as possible during the day. It is hard as I’m alone at home and try to things done as much as I can. Currently we go for walks every single day, she has lots of sensory toys and blocks and a little bouncer which stays in for 20 minutes maximum. Her only screen time during the day will be when I need to cook for about an hour and she’ll watch ms Rachel. We also attend baby classes every Monday. But she tends to get bored of things very quickly. Any activities (even if it’s together) that kept babies entertained and enjoyed? Or any sort of toys which your babies loved?