Begin reading daily more 4 part music ie hymnsAlso sigh reading daily easier baroque works as wellAside from practicing more you can take a speed reading course this will allow you eyes to see more of the page and and scan page more quicklyGenerally you want to Get in habit of playing while reading ahead of where you are playing so you anticipate what is coming next and read ready to be there and play
(Plus, I've read through most of my beginner pieces to the point I know how they sound so it's not really sight reading anymore...)
Yes it is.
No, it really isn't. It's reading, sure, but it's quite a different matter to pick up an unknown and previously unheard score and make music from it.
one of the reasons the beginner struggles to sightread is he has so few patterns well learned and grooved, stored in the memory banks.