is there any plugin for 1.15.2 which can remove items like swords with 1000 enchantment lvl,potions with 256 level etc?
I know essentials has a built in enchantment safety thing. So that might be an option. If your server is any of the version this plugin supports, it may be the fix you need: https://www.spigotmc.org/resources/itemfixer-remove-creative-hacked-items-from-your-server.34250/
Essentials' enchant safety would only stop the new enchanting of items, and only then using their enchant command. It will do nothing about existing items with unsafe enchants.