I've started doing quite a few of the suggestions here.
I can't use most shampoo bars, as they often contain SLS (Lush, I'm looking at you) whereas normal hand soap is fine (but not so good for my hair and scalp).
I'm looking into those plastic frozen food bags. If I open carefully at the top, and then wash out when empty, I can recycle the plastic into crocheted mats, etc, which can then go to a charity for handing out to homeless people for rough sleeping. I need a bigger hook, so that's on the list.
I'm also going to cut down on cotton pad use, along with DD. I've got some cotton that I can crochet into little pads for washing and reusing. I'm also going to crochet covers for my floor mop (has a rectangular head, a cover can sit over this) that can then be washed and reused. I've some balls of wool I was given that I can't really use so the covers, etc will use this up.
I do use washable sanpro, and while DD was hesitant, she's now looking into the different types of cups/pads. As she likes sewing, she's also looking into patterns for pads to make ones of the right thickness for her.
Each time I use something in the house, I'm making notes on whether it's fine to use, or if I can source or make an eco-alternative. It's not an overnight job, but slowly and steadily our household is working to be more sustainable and eco friendly.