There’s really nothing special about a multi-day tournament that should cause you to change your strategy. You know how to play a tournament, so just do your best, and if the cards fall your way, you’ll make the second day and then the third, etc. Of course most people bust on Day 1, so don’t assume that you did something wrong if that’s what ends up happening to you. There’s no prize for making Day 2, so it really shouldn’t affect your strategy at all. Worrying about it can only cause you to play first. Treat it like any other tournament IMO.