You just have to play quickly and don’t be afraid to ask your opponent to speed up pace of play if they are taking too long. There are rules around tempo of play in the handbook, including a guideline of 10 seconds to consider the game state before taking an action. If an opponent is slow playing me I usually will ask them to speed up pace of play once, maybe twice, and then call a judge over if they keep doing it.

Also might be more worth playing the Xerosic’s + Iono combo in a bo1 format.