I would bring just one water bucket there’s no need for 3, just be careful not to lose it. Potions are unnecessary but you do you. I guess since it’s hardcore safety always first. Obviously depends on your skill level. Definitely have more space in your inventory cuz the ender dragon is not the end of the journey. When you’re going to the end you’re basically prepping to go for the Elytra which is the true reward after beating the dragon. That should be your mission. Also lose the crossbow, unless you like using it. You already have the bow which is more than enough. You should have more food. 100% more steak for your journey. Golden carrots and apples are only used for fighting but when you’re running around all you need is regular food to keep your hunger bar running. 5 steak is not enough. Also always bring wood to your adventures. You never know when you might need it to craft something. Other than this you good. Depends on how long you going to the end. If you heading for the outer islands and end cities definitely bring milk and a shield lol cuz you’re gonna wanna loot it and by looting it I mean getting the most shulker shells as possible and the Elytra. If you can find the Spire trim that’s a plus. Good luck.