For any tournament, I think it’s important to be well rested and to follow good routines, like getting enough sleep, exercising, and eating properly, along with studying the game. All of that adds up over time.
That said, when there are many tournaments running, it’s not always easy to prepare perfectly. Personally, I play my best when I disconnect from technology for a while before the session. It helps me clear my mind and start the tournament more focused, instead of being mentally overloaded before it even begins. That’s what works best for me. Good luck to everyone in their tournaments.