BigBox

You can download the official Curse Forge launcher here: curseforge.com

With mods from BigBox, you can explore the new beautiful biomes, thanks to Biomes O' Plenty, and dig into different structures, even underground.
Using many new ores and materials you can make your life easier, by making various machines starting from Energized Smelter to Fusion Reactor.
You can place this stuff in a house made with Chisel, which adds many customize options.
If you need a break, have fun with more than 100 different birds!

List of mods:

Alex's Mobs (by alex_khaan)
All the Ores (by ATMTeam)
Angel Ring (by DenisMasterHerobrine)
Architectury API (by shedaniel)
AutoReglib (by Vazkii)
Better Default Biomes (by Xratedjunior)
Better Dungeons (by _ForgeUser7772252)
Better Mineshafts (by YUNGNICKYOUNG)
Better Strongholds (by YUNGNICKYOUNG)
Big Brain (by almightytallestred)
Biomes O' Plenty (by Forstride)
Bookshelf (by DarkhaxDev)
Chicken Chunks (by covers1624)
Chisel (by tterrag1098)
Citadel (by alex_khaan)
Clumps (by Jaredlll08)
CoFH Core (by TeamCoFH)
CodeChicken Lib (by covers1624)
ConnectedTexturesMod (by tterrag1098)
Craft Tweaker (by Jaredlll08)
Cucumber Library (by BlakeBr0)
Curios API (by TheIllusiveC4)
Default Options (by BlayTheNinth)
Dungeon Crawl (by xiroc_)
Dungeons Mod (by dainxt)
Exotic Birds (by ThePavoReality)
Explorer's Compass (by BlakeBr0)
ExtraStorage (by 3divad99)
Extreme Reactors (by ZeroNoRyouki)
FTB Library (by FTB)
FTB Quests (by FTB)
FTB Teams (by FTB)
FallingTree (by RakSrinaNa)
Farmer's Delight (by vectorwing)
Ferrite Core (by malte0811)
Flux Networks (by sonar_sonic)
Garbage Bins (by liskoslayer63)
Guard Villagers (by almightytallestred)
Hwyla (by TehNut)
Industrial Foregoing (by Buuz135)
Inventory Pets (by Purplicious_Cow_)
Iron Chest (by ProgWML6)
Item Filters (by LatvianModder)
Item Zoom(by mezz)
JEI Integration (by SnowShock35)
JEI Professions (by pau101)
Just Enough Calculation (by towdium)
Just Enough Items (JEI) (by mezz)
Just Enough Resources (by way2muchnoise)
Macaw's Bridges (by sketch_macaw)
Macaw's Lights and Lamps (by sketch_macaw)
Mantle (by mDiyo)
Mekanism (by bradyaidanc)
Mekanism Additions (by bradyaidanc)
Mekanism Generators (by bradyaidanc)
Mekanism Tools (by bradyaidanc)
More Villagers (by SameDifferent)
Mystical Agradditions (by BlakeBr0)
Mystical Agriculture (by BlakeBr0)
Mystical World (by Noobanidus)
Nature's Compass (by Chaosyr)
NoPhantomNoCry (by H3lay)
OpenBlocks Elevator (by vsngarcia)
Patchouli (by Vazkii)
Placebo (by Shadows_of_Fire)
Quark (by Vazkii)
RSInfinityBooster (by hexeptiondev)
Refined Storage (by raoulvdberge)
Refined Storage Addons (by raoulvdberge)
Refined Storage: Requestify (by Buuz135)
Repurposed Structures (by telepathicgrunt)
Selene Lib (by MehVahdJukaar)
Sodium (by jellysquid3)
Structures Plus II (by Qra5)
Supplementaries (by MehVahdJukaar)
The Twilight Forest (by Benimatic)
Thermal Cultivation (by TeamCoFH)
Thermal Expansion (by TeamCoFH)
Thermal Fundation (by TeamCoFH)
Thermal Innovation (by TeamCoFH)
Thermal Locomotion (by TeamCoFH)
Tinkers Construct (by mDiyo)
Titanium (by Buuz135)
U Team Core (by HyCraftHD)
Useful Backpacks (by HyCraftHD)
Voxelmap (by MamiyaOtaru)
Wawla - What Are We Looking At (by DarkhaxDev)
XP Tome (by bl4ckscor3)
YUNG's API (by YUNGNICKYOUNG)
YUNG's Extras (by YUNGNICKYOUNG)
ZeroCore 2 (by ZeroNoRyouki)

Manual Install:

FORGE: The latest version of Forge for 1.16.5 should work, but forge-1.16.5-36.2.0-installer.jar is the version used in the testing process.

PARAMETERS: Recommend allocating 4GB's of RAM. You can do this by going to Launch Options, enabling JVM Arguments, and changing "-Xmx1G" to "-Xmx4G".

FILES: Make sure there is nothing in your Mods or Config folders, then copy the folders over from this modpack into your Minecraft directory.