Rebuild the world as you see fit.

Recreate the land with magic, using ProjectE, Mystical Agriculture, Embers, Soul Shards: The Old Ways, Parachronology, and Totemic.

And Recreate society, creating a new colony for new residents of the new world with Mine Colonies, and using science, with Actually Additions, Applied Energistics 2, Better With Mods, Draconic Evolution, Environmental Tech, Extreme Reactors, Forestry, Immersive Engineering, Industrial Craft, The Thermal Trio and their agrarian addition (Thermal Cultivation, Thermal Dynamics, Thermal Expansion, Thermal Foundation), and Water Power.

Starting Off - Get Lava

Parachronology

Harvest the moments of creatures you slay by creating a mob spawning room 40 blocks away.

Using the Simple Moments you get use them on trees you grow to turn the wood into petrified wood, which is usable as cobblestone.

Once you have 8 cobble, using a sapling make a simple moment.

Using the simple moment and the 8 cobble, craft a Chrono Displacer.

You can feed the Chrono Displacer by dropping any moment other than a basic moment close to transform nearby block around it into different blocks.

Input Possible Result

Wood Cobble

Smooth Stone

Gravel

Cobble Iron Ore

Coal Ore

Dirt

Iron Block Obsidian

Sapling Any other vanilla sapling or a rubber sapling

Once you have a Moment and a bucket you can make lava.

And if you use a simple moment and a bucket will give you water.

Sky Resources 2

To open the Sky Resources 2 guide press G on your keyboard.

To get lava with Sky Resources 2 you will want to craft a Wooden Combustion Heater and a Wooden Casing, which you will use to build a combustion chamber.

Once you have your combustion chamber built you will wand a source of red stone power, a button will work, which you will want to use the trigger the combustion.

You will want to feed the combustion chamber a source of fuel and throw some gunpowder in the chamber to get some blaze powder.

After you have 4 blaze powder you will want to make a Blaze Block.

Once you have your blaze block you will wand to place it over a torch which will slowly turn it into a block of lava.

Starting Off - Ore Gen

One you have a cobblestone generator, you can easily turn it into an ore generator by providing a red stone signal next to where the cobble appears in your generator.

Yet Another Skyblock