now just add a label to each step as follows and you would be further in understanding music theory
(1) Root
(2) b9
(3) 9
(4) b3 or #9
(5) 3
(6) 4
(7) b5
(8) 5
(9) b13 or #5
(10) 13
(11) b7
(12) 7
Then look at the keys in this sequence
(1) Root
== b9
== 9
== b3 or #9
(5) 3
== 4
== b5
(8) 5
== b13 or #5
== 13
== b7
(12) 7
The root, 5, 8, and 12th step make up a regular Major seventh chord. Then all you have to think about is how the quality of the chord is affected by how many steps you move those notes up a down (usually just a step).
If you advance to visualizing it like this you’d be able to construct a chord in a microsecond.
For example, if said, B7b9 or G7#5#9 you’d be able to figure it out quickly by noting the relationship of the “extra notes” to a regular major chord.