Get a boat for trapping Endermen for easy-kills. Have a bow and a lot of arrows for destroying the Ender Crystals. For caged ones, tower up to them, make a hole on the cage, build a platform away from the Crystal, then use bow to destroy the Crystal through your hole.

Avoid purple particles from the Dragon's projectile. DON'T USE BEDS! IT'S NOT WORTH IT! Stick with your sword, not an axe, bc axes are not updated. If you get launched into the sky, throw an Ender Pearl from your easy-kills towards the ground. Aim for Dragon's head.

I cant because I'm already in the end and I dont have wood

make the bedrock one cycle