Have you tried audio books?
They can follow the story in a "real" book if they want, but it is not necessary.
You could also read with them. Taking turns to read bits.
Do they have any particular interests? Perhaps non- fiction books would be good for a change, again if you read them together.
My son also particularly enjoyed joke books - but you have to be prepared to put up with corny jokes constantly.
How about books in your home language? Local libraries often have a good selection and also some bi lingual books.
Good Luck most children suddenly find something that sparks their interest it just takes some longer than others, however.
Haven't tried audio books, but I wonder how they differ from watching TV? Isn't the learning linked to actually reading the words?
Yes, reading with them could be a solution. We tried it a couple of times, and they didn't seem to mind it. But, it drove me crazy
I couldn't stand the pace of reading out loud when my eyes already finished reading the page. And the whole reading to kids feels so unnatural to me, since it was not what I personally experienced. It feels "wrong" (though it is not) to spend so much effort for something that should be innate (at least based on my personal experience). I need to force myself a bit more and overcome that loathing
We give him access to books in both languages, only success is with continental comics (is there a proper word for these books actually? Comics is for US stuff, Manga for Japanese ones, Cartoon is for TV ones I guess... ) At least he's loving them, but I would feel more relaxed if he actually read and understood all the speech bubbles.