Unconventional advice, but read kids/YA books. They’re shorter and get to the point much quicker, and once you get in the swing of reading those you’ll build up tolerance for longer reads.

And don’t assume all kids books are basic kids material. Many classics have been written in more simplistic form so you still get the gist without the labor. Likewise with non-fiction.

For what it’s worth, I’m a teacher and have to find creative ways to help kids love to read. To me, a cereal box, a comic strip, even Pokémon cards are good starters to get kids to learn to love reading. There’s no shame in adults finding fun ways, too.