Thank you for the suggestions.
To answer those saying "why bother? Go and do something else if reading isn't fun,". I know that reading IS fun, from my previous experience and I feel lost without it in my life, as though I've been deserted by a much-loved spouse.
To the peeps suggesting that I should read something I've loved before: the Blyton seems to be helping a little, though I think I've lost my "reading stamina" so can't read for long before needing to do something else. Hopefully, this will be overcome by practise.
elemenOP: I think you may have hit the nail on the head as to the cause of this slump. I have far too many books on my ereader, which seems to devalue each one and make it hard to choose between them. I thought that watching vids about books kept reading as part of my life and might rekindle my desire to read. Maybe it's providing a poor substitute.
Dr. Drib: yesterday, I felt a little dizzy, so listened to a badly abridged audiobook of "Pride and Prejudice" lasting all of two hours! And read by Joanna Lumely. It was a Christmas present from a friend who was unaware that I don't like Austen. The abridgement improved Austen's prose imho - I think reading Austen is like wading through glue - so I enjoyed the story, even though hugh chunks were left out. Your OTR progs sound intriguing.
issybird: I suppose Blyton is my ice-cream. You can keep the exercise!
My personal genre preferences are: historical fiction; humour; light romance; classics, but not Austen; classic children's fiction.
I sometimes, though rarely read horror or paranormal novels, and I've tried, but not been able to get into, sci fi.