It has only been 3 days. No need to panic just yet. That said, learning numbers with Major should be a simple process. I think you are overcomplicating things for yourself.
Try to start by learning just the 10 primary sounds. One for each single digit number. Don’t worry about the alternate sounds until a little later.
To aid this, try using a familiar location where you can pick out 10 unique and sequential landmarks. You will place each number and an image that gives you the sound at each landmark. Then when you imagine navigating this route, you will have reinforcement for each number. Your home is usually a great place to start.
Lets say that the first 3 locations are your parking space, the stairs to your building, and the door in to your home.
I’ll give you a suggestion for the image that will be solely based on the Major sound. Try using them at first. You can modify them later, but give these a try to start while learning the sound associations.
1 = T. The straight line down of a 1 should remind you of the straight line down of a letter t. The image for 1 is a Tie. As you arrive at your parking space (location 1) you see that instead of pavement or concrete, you have parked on a giant colorful outlandish necktie. 1 = Tie. 1 = the T sound.
2 = n. If you turn a lowercase 2 on its side, it looks like an n. There are 2 “legs” on a lowercase “n”. The image for 2 is Neo from the matrix. You are walking up the stairs (location 2) and Neo is doing his iconic bullet dodging move as he flops down the stairs like a slinky past you. 2 = Neo. 2 = the N sound.
3 = M. The 3 looks like an m on it’s side. There are 3 legs on an m. The image for 3 is “me.” Picture yourself. You open your door (location 3) and you are startled to see a clone of yourself greet you. This clone is creepily mirroring your every move. 3 = Me. 3 = the M sound.
You can continue this approach with the rest of the digits. Determine 7 more sequential landmarks. Take images for 4 (R), 5 (L), 6 (J), 7 (K), 8 (F), 9 (P), and 0 (S) and link them in a memorable way to those locations. Here are my suggestions:
4 Ray (a ray gun)
5 Lei (a flower necklace)
6 Jay (bluejay bird)
7 Key (old fashioned big skeleton key)
8 Fu (a kung fu master with a big fu manchu mustache)
9 Pie (steamy fresh baked apple pie)
0 Saw (like a lumberjack would use)
As you navigate those 10 locations, say the number and the mnemonic image, and the sound for that number. You should be able to learn the 10 base sounds very quickly this way. Like, within an hour or two.
Try it out. Work on it for a few days and they should stick and be just about second nature. Once they are locked it, work on adding the alternate sounds:
0 S/Z
1 T/D
6 J/Ch/Sh
7 K/G
8 F/V
9 P/B
That is only 7 additional sounds and then you’ll have the entire major system phonetic mapping learned. Once you are comfortable with that, you can start searching for matches for the 1 digit numbers, like 10 = ToeS. 11 = ToaD. 12 = ToNy… Etc. But, get the basics down first so that you have a strong foundation to build from!