I made our ADRs for June about 3 weeks ago when we booked our trip. I was finally able to get CRT two days ago, so don't give up hope!
Here is what I did. I made a list of which parks were my first choice for each day, along with my 2nd choice for each day of our visit.
I then made a list of my priorities. Mine were, a princess meal, a mickey meal and a pirate cruise. If you can be flexible about what you need and when, you will have a lot better luck.
On my first call, we got Akershus princess breakfast on the day I wanted, Garden Grill on the day we wanted and tha pirate cruise on the day I wanted.
I would have preferred CRT so I kept calling back. I was finally able to get that 2 days ago and I also added a breakfast at Ohana.
I think that it helps to be specific about what you want, as it helps the CM help you, BUT be flexible and ask for alternatives. Keep a park map handy if you are not familiar with the park so that you can tell if a choice will work for you.
I have called about 10 times for our June trip. Some CMs were wonderful, amazing and so helpful. Others were very matter-of-fact, just doing the booking, not especially special. Make the reservations that you can, look at what you've got, re-plan and call again.
You need to call ASAP but you can still get ADRs, including some of the very popular ones.