You cannot reliably kill the Warden in survival without extreme preparation
Use ranged attacks from a safe distance
Build a high platform or enclosed shooting position
Use a bow or crossbow with strong enchantments
Use powerful weapons and armor if fighting up close
Keep moving to avoid its melee and sonic attacks
Use blocks to create barriers and break line of sight
Lure it away from your target area before fighting
Avoid triggering more shriekers while fighting
Use lava, traps, or environmental damage if available
If possible, simply avoid the Warden instead of fighting it