If this was me, I’d have my house valued and put it on the market and see what happens.
I’d consider a garden flat too or a bungalow with a not too large garden.
Stairlifts are great, BUT, when you live alone, my mother struggled getting things up and down the stairs once my DF died.
Future-proofing and/or moving are so much better done when you’re still fit and healthy and fully mobile.
Good luck, whatever you decide. 
According To The BBC Weather Website....
