I searched a lot online I was stuck too. In every post I found, people did not know what to do. So here is a simple guide on how to transfer your items.

Step 1 - Requirement

Your server will need to be on phase 6
Sign up for a New Season and select a server

Step 2 - Finish everything you want to in the current season before transferring.

- Purification reset - do it before you transfer
- Buy starchrome crates from the shop - costs 390k EL
- Buy out the starchrome crate from the vendor (8x - cost 100x stellar planula)
- Collect any Blueprints & weapon attachment blueprints you need

Step 3 - Transfer to new season - Yes Just transfer to the new season.

All your items on your inventory and storage will be transferred to the Eternal Land Spacetime backpack.
You will also get 20k points to spend and move items to the new season, spend it wisely.

Personal recommendation - Transfer Advanced Electric Drill & Chainsaw

Here is the cost to transfer items

Acid 10
Activator 200
Activator - Long-Acting 400
Activator - Quick 300
Activator - Quick Long-Acting 600
Activator - Wide-Area 800
Adhesive 5
Adrenaline Shot 1000
All-Purpose Hand 500
Ammo - Copper LMG 1
Ammo - Copper Pistol 3
Ammo - Copper Rifle 1
Ammo - Steel LMG 2
Ammo - Steel Pistol 6
Ammo - Steel Rifle 2
Ammo - Steel Shotgun 10
Ammo - Steel SMG 2
Ammo - Steel SR 10
Ammo - Tungsten LMG 4
Ammo - Tungsten Pistol 12
Ammo - Tungsten Rifle 4
Ammo - Tungsten Shotgun 20
Ammo - Tungsten SMG 4
Ammo - Tungsten SR 20
Armor - Beret - Tier V 5000
Armor - Lonewolf Gloves - Tier V 5000
Armor - Lonewolf Jacket - Tier V 5000
Armor - Lonewolf Mask -Tier II 2000
Armor - Lonewolf Mask -Tier V 5000
Armor - Lonewolf Pants - Tier II 2000
Armor - Lonewolf Pants - Tier V 5000
Armor - Renegade Jacket - Tier II 2000
Armor - Renegade Shoes - Tier II 2000
Armor - Renegade Shoes - Tier V 5000
Armor - Scout Gloves - Tier II 1000
Armor - Scout Hood - Tier I 500
Armor - Scout Hood - Tier II 1000
Arrow 5
Arrow - Copper 10
Arrow - Steel 20
Arrow - Tungsten 30
Assorted Canned Fruit 200
Bait - Crank 20
Bait - Dough 1
Bait - Mince 3
Bait - Mixed Spices 3
Barreled Premium Fuel 100
Beet 10
Biomass Missile 3000
Blue Liquor - Proof of Friendship 500
Blueberry 10
Blueberry Soda 50
Boiled Water 2
Bone-In Deviated Sausage 200
Bread 50
Bread with Jam 50
Butter 20
Cabbage 10
Cactus 10
Canned Lunch Meat 100
Canned Meat 100
Canned Seafood in Oil 200
Caviar 20
Charcoal 3
Cheese 20
Controller 20
Corn 10
Corn Ale 100
Corn Oil 10
Cornbread 50
Crocodile Egg 30
Crystal - Beryllium 100
Crystal - Iridium 200
Crystal - Platinum 250
Crystal - Vanadium 150
Curiosity Catcher I 200
Curiosity Catcher III 500
Detoxident 25
Detoxident - Poly 50
Detoxident - Refined 75
Deviated Plants - Orange 100
Deviated Plants - Purple 80
Deviation Production Items (All) 20
Deviations (All) 800
Dirty Water 1
Dried Cactus 20
Eclipse Cortex L1 10
Eclipse Cortex L2 30
Eclipse Cortex L3 90
Electric Rock Drill 2500
Electric Rock Drill - Advanced 3000
Electronic Part 5
Explosives 400
Explosives - Improved 800
Fabric - Bulletproof Fiber 15
Fabric - Carbon Fiber 5
Fabric - Cotton 5
Fabric - Metallic 10
Fabric - Shabby 5
Featherweight 500
Fertilizer 10
Fertilizer - Breeding Boost 20
Fertilizer - Mutation Boost 20
Fertilizer - Yield Boost 20
Fishing Rod 200
Flowers (All) 10
Fruit Tea 50
Fruity Sanity Gummy 200
Fuse 20
Fusion Lighter 300
Glass 10
Gravel 1
Grenade 400
Grenade - Improved 1000
Gun - AKM - Tier I 500
Gun - Boom Boom - Tier II 4000
Gun - Burning Rage - Tier II 5000
Gun - Div-Evo - Tier V 11000
Gun - Last Valor - Tier II 4000
Gun - Last Valor - Tier V 10800
Gun - Pioneer - Tier I 1000
Gun - Recurve Crossbow - Tier II 4000
Gun - Recurve Crossbow - Tier V 10500
Gun - Rustic Crossbow - Tier I 500
Gunpowder 50
Hawthorn Berry 10
Healing Bandage 50
Ingot - Aluminum 60
Ingot - Bronze 40
Ingot - Copper 20
Ingot - Steel 50
Ingot - Tungsten 80
Large Fish Jerky 50
Large Jerky 50
Living Armor 500
Logging Chainsaw 2000
Logging Chainsaw - Advanced 2500
Malt Ale 100
Masala 10
Meat (All) 10
Melee - Camping Knife - Tier I 1000
Melee - Camping Knife - Tier II 2000
Melee - Frozen Northern Pike - Tier V 11000
Melee - Stun Baton - Tier II 5000
Melee - Stun Baton - Tier V 11000
Metal Scraps 5
Mixed Explosives 500
Mixed Fried Hot Dog 200
Molotov Cocktail 200
Molotov Cocktail - Deadly 700
Molotov Cocktail - Improved 300
Mushroom 10
Orange Soda 50
Ore - Aluminum 5
Ore - Copper 3
Ore - Gold 50
Ore - Iron 3
Ore - Silver 20
Ore - Stardust 20
Ore - Tin 3
Ore - Tungsten 10
Part - Automatic 15
Part - Refined 5
Part - Rusted 5
Part - Special 10
Part - Standard 5
Peppercorn 10
Pickaxe - Alloy 1500
Pickaxe - Bronze 500
Pickaxe - Copper 100
Pickaxe - Crude 50
Pickaxe - Steel 1000
Pickaxe - Tungsten Alloy 2000
Pickle 20
Plastic - All-Purpose 5
Plastic - Engineering 10
Plastic - Fireproof 5
Plastic - Special 15
Plastic - Waste 5
Polluted Water 1
Portable MG Turret 900
Portable Mixed Fuel 10
Potato 10
Preserved Deviated Chops 200
Preserved Meat 20
Projection Generator 900
Pumpkin 10
Pumpkin Porridge 50
Purified Water 2
Rawhide 10
Rubber 5
Saffron 20
Sage Ointment 50
Salt 10
Sanity Gummy 50
Sea Water 1
Securement Soup 300
Seeds (All) 10
Shrapnel Grenade 400
Shrapnel Grenade - Improved 1000
Sintered Brick 20
Smoke Bomb 700
Space Twister 500
Spectral Canned Mushroom 300
Spectrum Generator 500
Spoiled Food 1
Spring Legs 500
Stardust Corn Ale 100
Stardust Energy Drink 200
Stardust Italian Soup Can 200
Stardust Mushroom Soup 200
Stardust Ratatouille 200
Stardust Source 2
Stardust Tea 200
Stargazy Pie 300
Storage Battery 500
Sugar 10
Sulfur 3
Taco 200
Throwing Dagger 20
Tranquilizer Needle 300
Transformation Cookie 500
Utter Delight 500
Vortex Generator 800
Weapon Calibration - Blue 500
Weapon Calibration - Orange 1000
Weapon Calibration - Purple 800
Whisper 10
Wood 1
Yuanbao Dumpling 400