Technology might help initially, it certainly allowed my mum to live at home alone for a number of years before I introduced a carer - paid for by me using my POA to access mums money.
Many devices require internet connection so the first thing I did was get mum out of the house for an afternoon so I could install a router from her phone company. I hid it under a cupboard so mum could not see it!
Hive heating - allows you to control the heating from your house. I left the old disconnected thermostat in the hall so mum could fiddle with it and still feel in control.
Ring door bell and security cameras - alerts to my phone when anyone called at the house, I could then intercept if they were scammers or cold calling. The cameras enabled me to see when mum left the house and when she got back, I livd about half an hour away so was prepared to get in my car if she did not return home as expected.
Also has cameras in the lounge and kitchen so I could see that mum was out of bed and pottering around safely.
A key safe - so I could get a neighbour to let mum in if she lost her key or let emergency services in if necessary, great peace of mind.
I also installed a Call Blocker from a company specialising in support for dementia ( True Call). I input the people I wanted to be able to call mum, everyone else got a message telling them to call me ( gave my mobile number) if they needed to speak to mum, with held number calls and overseas calls were barred completely.
My mum decided to turn off all electrical appliances at night, even pulling out the fridge freezer to unplug it so I had cages or blank plates fitted over the plugs so she could not get at them. Somehow people with dementia seem to ignore plugs and sockets if they cannot see them
Had to get rid of the Virgin TV package as mum got confused with the remotes and kept switching between Virgin and the Smart TV then she’d phone me to complain that the tv was broken! I taped over the unnecessary controls on the tv controller so all she had access to were the five main channels and the on/off button.
I scratched off the cvc number from her debit card to stop her buying things over the phone and made sure her credit card “ got lost” - eventually she stopped asking about it.
It’s really hard but Mum managed to live alone for six years after her diagnosis until Covid caused too many problems for me to cope with and after a hospital stay following a fall at home, she was discharged to a care home.