After thinking about this, and not being able to fall asleep, I've now come to the conclusion that there are
four main timelines.
Classic Timeline: TOS through FC
Then the Borg go back in time to 2063, which creates the...
Pheonix Timeline: ENT in the "past", FC through PIC in the "present" (from a 2401 point of view)
Centuries later, the Temporal Cold War happens, followed by all-out actual Temporal War; which creates the...
Disco Timeline: DSC S1-S2 and SNW in the "past", DSC S3-S5 in the "present" (from a 3188+ point of view)
In Pheonix 2387, Nero goes back in time and creates Kelvin 2233, which leads to the...
Kelvin Timeline: The three JJ Abrams Movies
By the 32nd Century, the Kelvin Timeline and the Disco Timeline are pretty far apart from each other.
.
.
.
.
So, what goes where?
Classic: TOS, TAS, TMP-TUC ... (time skip) ... TNG, DS9 S1-S5, VOY S1-S3, GEN-FC
Pheonix: ENT ... (time skip) ... FC-NEM, DS9 S5-S7, VOY S3-S7, LD, PRO, PIC
Disco: DSC S1-S2, SNW ... (time skip) ... DSC S3+
Kelvin: Self-Explanatory
That killed some time. How the Hell am I still not tired?
Anyway, like I said before, it's become like how they do it in comics. I could've made TOS and TAS a fifth timeline, but I can't think of a time-travel incident that would cause such a split, so I didn't.
Probably a good time to mention I'm also a huge fan of
Back to the Future. I love all of them, but
Part II is my favorite. Bet you never would've guessed.
For me, unlike others, this is all still fun. It's like a mind game. I don't let it take over my enjoyment of what I'm watching. So please take this all in the spirit it's intended in. Thanks!