I'm getting into the peaceful any% categories but I'm having trouble with the ender dragon fight. I can't find any good resources or guides on how to do 
it fast, is there a good way to do it that fits into that category and isn't extremely reliant on rng?

This is minecraft, every category is extremely reliant on rng. That one more than most. You can grab a bed or two if you want, which might help a bit.

Help with ender dragon fight

AprilSR

wade324

KilleDragon

Minecraft: Java Edition Category Extensions

ItaiKu1337

thecamo6

Dibedy

unsortiertes

clayzz

Diamond

Cake

Golden Apple

Emerald

Structures

No Structures

Wither

Elder Guardian

All Bosses

Set Seed Glitchless

Random Seed Glitchless

1.10

1.11

1.12

1.13

1.14 Easy

Normal

Hard

Hardcore

1.8.9

1.12.2

1.14.2

1.7.2

1.14.4

1.14.3

1.13.2

1.5.2

1.8.8 No F3

1.7.9

1.2.1

1.2.2

1.2.3

1.2.4

1.2.5

1.7.10

1.3.1

1.3.2

1.4.2

1.4.4

1.4.5

1.4.6

1.4.7

1.5.1

1.6.1

1.6.2

1.6.4

1.7.4

1.7.5

1.7.6

1.7.7

1.7.8

1.8.1

1.8.2

1.8.3

1.8.4

1.8.5

1.8.6

1.8.7

1.9.1

1.9.2

1.9.3

1.9.4

1.10.1

1.10.2 Item

Structures (Obtain Item)

Boss

SS/RS/SSG/RSG (Kill Bosses)

SSG/RSG (Enter Nether)

SSG/RSG (All Swords)

SSG/RSG (All Woods)

SSG/RSG (All Wool)

SSG/RSG (Full Iron 15 Levels)

SS/RS/SSG/RSG (HDWGH)

Version

Difficulty

Sub Version

Structures (Enter Nether)

Structures (All Swords)

Structures (Full Iron 15 Levels)

SSG/RSG (All Minerals)

Structures (All Minerals)

Version (All Bosses)

Mods

SSG/RSG (Hero of the Village)

SSG/RSG (All Workstations)

SSG/RSG (Full Inventory)

Structures (Full Inventory)

Version (All Swords)

Version (All Minerals)

Version (All Wood Logs)

SS/SSG (Enter End)

SSG/RSG (Arbalistic)

Item (Glitched)

SS/RS (Enter Nether (Glitched))

SS/RS (All Wool (Glitched))

SS/RS (Full Iron + 15 Levels (Glitched))

Structures (Full Iron Armor + 15 Levels (Glitched))

SSG/RSG (Obtain Item)

SS/RS (All Swords (Glitched))

Structures (Arbalistic)

SSG/RSG (All Versions)

Version Range

Difficulty (All Versions)

SSG/RSG (Sonic, Tails, and Knuckles)

SSG/RSG (20w14∞)

SS/SSG/RS/RSG (Mine a Chunk)

Dimension (Mine a Chunk)

SS/SSG/RS/RSG (Stack of Lime Wool)

SS/SSG/RS/RSG (All Portals)

Version (Filtered Seed Glitchless)

Player Count (Mine a Chunk)

Subcategory (15w14a)

SS/SSG/RS/RSG (15w14a)

Version (Half%)

SS/SSG/RS/RSG (Half%)

Player Count (Filtered Seed Glitchless)

Version (All Wool)

/seed (SRG)

SSG/RSG (Pride%)

RSG/SSG/RS/SS High%

Version (HDWGH)

Version (All Portals)

SSG/RSG (Cover Me in Debris)

Structures (Cover Me in Debris)

Version (Enter Nether)

Version (Mine a Chunk)

**Split select categories affected by the 1.19 update:**

• Added 1.19 split to All Advancements.
• Added 1.19+ split to How Did We Get Here?
• Added 1.19+ split to All Wood Logs.
• Added 1.19+ split to Kill All Bosses:
‣ Kill the Ender Dragon, a Wither, an Elder Guardian, and a Ward

1.19 Categories + Cover Me In Debris

Category Extensions Update

Minecraft

Category Extensions Extensions

Please request new categories in #category-submissions on the discord

Rules Update (Providing Seed)

Poll: Allow Dungeons And Nether Fortresses (1.0-1.7.10) in categories with No Generated Structures.