I have the opposite experience. 95% of my work was published 2018 and before, and I'm a full time author.
My first novel (published 2001, and then published on Amazon in 2011) is my bestseller. it was permafree from 2011 until 2018, and the also-boughts are all over the place. But even so it sells.
Books 2-7 in the same series were written and published between 2002 and 2014, and they sell as well.
(Genres: Science fiction humour, fantasy humour, space opera, historical paranormal, middle grade, scifi adventure and one non-fic.)
I was wide for years, and went KU exclusive at the end of 2019. Either way works for me - wide meant occasional bookbubs, exclusive means AMS + pagereads.