Everything you have done so far is right on track and also the same things everyone else who is applying is doing. I am sure you will shadow a CRNA if you have not already, but that is kind of a no-brainer.
The one thing I would do that will really set you apart is to learn everything you can about what CRNA's actually do. I don't mean reading anesthesia books, but you should know the difference between regional and general anesthesia. You should know what an opt-out state is and what the anesthesia care team model is. This is basic stuff, but a lot of potential applicants don't really have a grasp on what exactly they are getting in to and if you do a little homework it will look good and serve you well.
For example, when I was doing the little meet and greet with current students at one school, there was a current student who did not know what anesthesia assistants were and they were training at the same hospital he was. Don't let that be you. Get yourself as familiar with the practice landscape as you can now. I still don't know a lot of it myself, but I've only just started my schooling.
One tip I read on here years ago was to read the book Watchful Care. It's put out by the AANA - I think - (go to their webpage and look around for a few hours while you are at it), and is a very long and somewhat boring history of the CRNA profession and the AANA. It goes over how nurses got involved in anesthesia and what they are up to these days. Not only will it give you something to talk about during an interview, but it will give you a solid history lesson on the career you are pursuing. I mentioned reading it in one of my essays and it was the FIRST question the director of a program asked during my interview! Name drop Agatha Hodgins and you are in for sure.
It's an expensive book, but you can probably get it at the local health science library if you happen to have a big medical school anywhere nearby. Good luck.