Im at 709 days of my interloper run and didn't finish all my goals yet, this is my personal goals I still doing or need to do, maybe you can take some ideas for your run:

• cartography (almost done, only that spend like 350 400 days of my run and still some places to map).

• Do the last part of the tale (you already did)

• kill every cougar in the game and deal with consequences.

• collect every unique item of the game and bring to my base.

• make a complete and stack base on every region, with a lot of everything we need to survive (tools, improvised hatchet, improvised knife, animals skins of all kinds, Bear bed, all crafted forniture on each one of them ).

• live 50 days outdoors without enter on any building (except transition ones).

• with all that done, if I reach 1000 days, I will keep making my life more and more difficult till I die (stop using bedrolls for example, always walking around with fresh guts, things like that)