Keep moving to avoid the fireballs and the lingering cloud of Dragon’s Breath. Attack the Ender Dragon with bows or crossbows from a distance. If you have empty glass bottles, you can collect the Dragon’s Breath to use in potion-making. Hope it may help you!

Here are 4 rules that I know, I think it should be what it is:

Generally, any version of the game is allowed in an Any% speedrun. However, switching versions during a run is typically not permitted.

Watching ads to get keys/coins or skip missions is usually not allowed, as it can be considered external assistance.

Leaving the game during a run is often against the rules, as it may give an unfair time advantage.

Changing time settings to time travel within the game is usually not allowed. This is because it can be seen as manipulating the game’s intended mechanics.