Yes I agree - the German wool slippers like these and Gieswein are expensive but well worth it as they are warm, and breathable so you can wear them in summer with bare feet. They also often have support insoles, although you can use your own - I think these are important if you are mainly wearing slippers all day.
I use Skechers lightweight shoes (Reggae Fest for me). There are various easy on/off styles, so can go in and out without changing. But if your floors are cold they might not be enough.
Homeys! Cannot recommend too highly! Not the cheapest, but super warm, super comfy. With a sole that's good enough to take the recycling out or bring the logs in. So good that my son, my daughter and their partners are converts, too. homeys.co.uk/
Drapers of Glastonbury. Not cheap but real sheepskin that keeps your feet warm as toast. They will last a good year or more. Also they are made in Somerset so you are helping a British company.
I have Raynauds, so cold feet, M&S suede moccasin slippers are fine for me, £25, if it’s really cold I use Hothands foot warmers. The slippers are comfortable, have a back and proper soles for a walk to the bin.
Like Casdon I have sheepskin slipper boots from Celtic and Co, they are very cosy. They do a range of sheepskin slippers. Expensive but they last forever.
I’ve got those Beechnut but they’re looking a bit tatty now. I’ve just bought some pink velvety slippers from M&S in a sort of loafer style. Hard soles, so I can go outside and just £17.50, but I’ll get a warmer boot style pair for winter.
Kitty I wear Haflingers clogs, with arch support. They are very well fitting and safe to wear. Other styles are available by this maker. I've been wearing their indoor shoes/slippers for around 16 years. My daughter wears them too. I'm several years older than you and don't feel concerned about falling whilst wearing this type of footwear. They are on the expensive side, but worth the money.
I’ve just bought some sheepskin ones from Celtic&Co which are lovely, they cover your whole foot and have proper soles. There was a huge choice of colours.