EnchantLimiter
Put a limit to the maximum level obtainable in your server.
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EnchantLimiter

What is EnchantLimiter? EnchantLimiter is a high performance Bukkit/Spigot/Paper plugin that supports all Minecraft versions. It allows you setup a configuration to limit certain enchantments. Its mainly used to limit enchantments such as protection and sharpness, so players can have a fun PvP experience in survival servers, where using Protection 4 just leaves to very lengthy encounters that often end on no one dying.
Features - Prevents many ways to bypass the plugin, by listening to most of events involved in equipping, enchanting and picking up enchanted items. - Allows you to fully disable certain enchantments, for example, thorns, which is extremely boring for PvP.