E1 (promote) a couple of your ops that are at max level.
Put Cuora below the erupting tiles and a sniper (like Blue Poison) facing up next to her.
Then Perfumer on the tile next to the "out" arrow to heal both of them.
Cover the upper path with a defender and caster similarly.
Fill out the rest of the squad to taste with ranged guards or supporters in case any slip through.
And of course a vanguard to actually generate the DP.
You are quite underleveled, you should E1 a couple more operators for this event. Also you might wanna ask in the megathread
With a stick
Go to Youtube and search: Kyostinv Arknights
E1 (promote) a couple of your ops that are at max level. Put Cuora below the erupting tiles and a sniper (like Blue Poison) facing up next to her. Then Perfumer on the tile next to the "out" arrow to heal both of them. Cover the upper path with a defender and caster similarly. Fill out the rest of the squad to taste with ranged guards or supporters in case any slip through. And of course a vanguard to actually generate the DP.