Try this
There are five campaigns total available in Destiny 2 right now. Three are totally free and available for everyone (Red War, Curse of Osiris, and Warmind) while the final two are locked behind DLC purchases. Whether you have access or not, I’ll explain how to start all the campaigns with the guide below. Even veterans might not know how to access the standard campaign after returning. It’s sort of hidden!
Go to Amanda Holiday in the Tower . She’s located to the east, in the ship hangar. You can select these three campaigns under Legacy Content . These three campaigns are free and available to play for beginning players of Destiny 2: New Light .
That’s what I did when I was playing it but I’ve since deleted it to make space.