Keep trying. You might have more luck if you check in the mornings and later in the evenings.
We recently booked a trip for Dec. 8-16 (also a family dealing with a very long rough year and likely a hard 2020 ahead of us). With the trip being booked after the reservations system had opened and in the first week after RotR is supposed to open, I didn’t expect to get anything booked. But within three weeks of checking about three times a day I do have Savi, Droid Depot and Oga’s booked. DD and Ogas on our last day and Savis on our first.
In the period I was regularly checking, I definitely saw openings for the times you’re going to be there. Especially Dec 25. I was surprised to see that one multiple times. Keep checking!
I’ll keep my eyes open for you too. As I’m still checking (though less regularly) on the hope we might be able to get a Oga breakfast slot and Savis on the same day. So I’ll watch and DM you.
For Oga’s try setting up an alert on Mouse Dining, it’s free.
And, when I was worried, people told me part of what’s happening is that since the reservation guarantee entry into SWGE and the busy factor is unknown after RotR opens is unknown, some people might just be hoarding the reservations to guarantee they get into the land but will release them closer to the time. So don’t lose hope.
People are also reporting g that DD and Savis are taking walk ups during EM right now and it sounds like some people are even having some luck with that during the day. So do t give up.
Rooting for you and your family.