I often find i can’t concentrate on anything ‘heavy’. Books I have enjoyed recently that I found easy to read
Clare Chambers - Small Pleasures, In a Good Light
Lissa Evans - Crooked Heart, Old Baggage
Jenny Eclair - Moving
Belinda Bauer - Exit
You say “no” to non-fiction but not all is ‘serious’. I enjoy nature writing eg Robert McFarlane, Richard Mabey, or, going back a few years, Akenfield by Ronald Blythe, a story of an English village and its people.
I am currently reading Abir Mukherjee - A Rising Man. I could only find the large print copy in the library, the day I went, and although I don’t need LP it does make it seem easy to read. It’s a crime novel set in India after WW1 and beautifully narrated by the newly arrived English investigator, a traumatised ex-soldier.
Hope you get your reading mojo back, Lucca