

It gets worse over time but it also eventually gets better, after the deleterious recessive alleles have been eliminated. Like in herd animals where a herd has only one breeding male per generation, so every generation is half-siblings.
The general rule is that a population with a fixed degree of inbreeding will have a corresponding number of deleterious alleles so that the selection pressure balances out; but when you change the degree of inbreeding, you get a spike in expressed mutations until things balance out again.





Are you aphantasic (unable to form mental images of things based on descriptions)?
Have you tried audiobooks?
Have you tried reading books of movies you’ve already seen (so you don’t have to keep track of characters and plot, and can focus on the elements unique to prose)?