First things first. Head to the Eternity section on the destinations tab and go to The Rite of the Nine hub. There you should be able to claim some weapons and armour that will jump start your journey. After that I would just make your way through all of the campaigns that you’ve missed. I’m unsure what’s included with that pack but it shouldn’t be hard to figure out what order to go in. That should keep you busy for awhile at least.

Go get max gear and weapons from the Rite of the Nine vendor in Eternity. Finish Beyond Light. There's a bug if you do Final Shape that locks you out of stasis. Then, work through Witch Queen, Lightfall and end with Final Shape. There may be a bug as well if you don't finish Lightfall before Final Shape that affects strand. Shadowkeep is fun, but the routefinding can be difficult of you don't get a route marker. Most importantly, have fun!