What can you do?

Visit the Twilight Forest thanks to The Twilight Forest by Benimatic.
Visit the Otherside thanks to Deeper and Darker by KyaniteMods.
Visit the Everbright & The Everdawn thanks to Blue Skies by ModdingLegacy.
Visit the Aether thanks to The Aether by TheAetherTeam and enjoy additional content due to Deep Aether by TeamRazor.
Build a rocket ship and explore the solar system thanks to Ad Astra by alexnijjar.
Enjoy improved Nether, End, and Overworld dimensions.
Many quality of life features thanks to serilum.

New randomly generated structures:

Immersive Structures by https://www.curseforge.com/minecraft/mc-mods/immersive-structures

In addition to this mountain of content I have taken the time to go through each configuration file to ensure annoying and vanilla unfriendly modifications have been turned off (for example, Seagulls from Alex's Mobs no longer steal food from you and Pixies from Ice and Fire: Dragons no longer steal items). Please note dragons still grief blocks however configuration makes their roosts a bit less common.

Jeremahi Adventure