3rdamention
Member
Yeah it's a shame, no base season mode is probably the worst.
Ok, I believe if you go to MY GM, and load that up, you will get to the screen to set up your MYGM game mode (length of games, length of simulated games, etc.)
If you look at the bottom of the screen, you can hit R1 or R2 to switch to a different game mode. Isn't that the Season Mode you are looking for? I am not by my PS4 so I couldn't tell you for sure.