(Hypothetical situation) You are about to fight 1000 average players. What gear would you use?
You are about to take on a fight against 1000 Java Minecraft players who have never played PvP in their life.
Arena: Flat desert biome, no caves or valleys, 400*400 blocks.
Death drop is on, you can loot items from dead players.
Friendly damage is off for the 1000 players.
Assume both you and the 1000 players will not have FPS drops or ping spikes.
Gear for each of the 1000 players: Max Diamond armor, weapons, and tools (No spear), 16 gaps and 64 steaks, 1 stack of oak logs, 1 Unenchanted shield. 5 Strength II pots. 1 Extended Fire Res pot. 1 Extended Speed pot.
You may not include these items in your kit: Enchanted Golden Apples, Elytras, End Crystals, Respawn Anchors.
Other than that, you can choose any items obtainable in vanilla survival mode. You may store any items in Ender Chests and Shulker Boxes.
Edit: You don't have to use brute force solution. Traps are allowed as long as you can build them.