Thank you. This is the first season I have played.

Everyone always points this out and the answer is always the same, random seasonal missions

You have to wait for seasonal  missions that offer a free script.

Yes, there is enough to unlock everything.

I double checked that all the rewards were claimed, both on the bottom bar and on the plagueheart hexagons. Am I supposed to have enough scrip to unlock everything?

I've completed the season pass, but I'm 6 script short of unlocking the whole cosmetic tree. Normal?