You haven't even downloaded Remedy's Alan Wake 2 yet, assuming you're planning to, which means it's already time to start thinking about what you'll do once you've finished it. Apologies, the news beat is a cruel mistress and the present is always past, but in my defence, jumping irresponsibly around the timeline does make sense for a supernatural horror game that follows two characters through different dimensions.
Remedy's plans for the game include a chunky New Game+ mode, aka "Final Draft", which will hopefully arrive in late November, and two DLC packs, Night Springs and The Lake House. The first concerns Alan Wake's fictional in-game TV show, a homage to the Twilight Zone, while the second involves "an independent government organization" that can surely only be the Federal Bureau of Control.
